diff --git a/ash/accelerators/accelerator_commands.cc b/ash/accelerators/accelerator_commands.cc
new file mode 100644
index 00000000000000..24b8a62b13e84f
--- /dev/null
+++ b/ash/accelerators/accelerator_commands.cc
@@ -0,0 +1,36 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/accelerators/accelerator_commands.h"
+
+#include "ash/shell.h"
+#include "ash/shell_delegate.h"
+#include "ash/wm/window_cycle_controller.h"
+#include "ash/wm/window_util.h"
+
+namespace ash {
+namespace accelerators {
+
+bool ToggleMinimized() {
+  aura::Window* window = wm::GetActiveWindow();
+  // Attempt to restore the window that would be cycled through next from
+  // the launcher when there is no active window.
+  if (!window) {
+    ash::Shell::GetInstance()->window_cycle_controller()->
+        HandleCycleWindow(WindowCycleController::FORWARD, false);
+    return true;
+  }
+  // Disable the shortcut for minimizing full screen window due to
+  // crbug.com/131709, which is a crashing issue related to minimizing
+  // full screen pepper window.
+  if (wm::IsWindowFullscreen(window) || !wm::CanMinimizeWindow(window))
+    return false;
+  ash::Shell::GetInstance()->delegate()->RecordUserMetricsAction(
+      ash::UMA_MINIMIZE_PER_KEY);
+  wm::MinimizeWindow(window);
+  return true;
+}
+
+}  // namespace accelerators
+}  // namespace ash
diff --git a/ash/accelerators/accelerator_commands.h b/ash/accelerators/accelerator_commands.h
new file mode 100644
index 00000000000000..5fe2775bdbd6f0
--- /dev/null
+++ b/ash/accelerators/accelerator_commands.h
@@ -0,0 +1,23 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ASH_ACCELERATORS_ACCELERATOR_COMMANDS_H_
+#define ASH_ACCELERATORS_ACCELERATOR_COMMANDS_H_
+
+#include "ash/ash_export.h"
+
+// This file contains implementations of commands that are bound to keyboard
+// shortcuts in Ash or in the embedding application (e.g. Chrome).
+namespace ash {
+namespace accelerators {
+
+// Minimizes the active window, if present. If no windows are active, restores
+// the first unminimized window. Returns true if a window was minimized or
+// restored.
+ASH_EXPORT bool ToggleMinimized();
+
+}  // namespace accelerators
+}  // namespace ash
+
+#endif  // ASH_ACCELERATORS_ACCELERATOR_COMMANDS_H_
diff --git a/ash/accelerators/accelerator_commands_unittest.cc b/ash/accelerators/accelerator_commands_unittest.cc
new file mode 100644
index 00000000000000..7d75cb89aee3b8
--- /dev/null
+++ b/ash/accelerators/accelerator_commands_unittest.cc
@@ -0,0 +1,31 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/accelerators/accelerator_commands.h"
+
+#include "ash/test/ash_test_base.h"
+#include "ash/wm/window_util.h"
+#include "ui/aura/window.h"
+
+namespace ash {
+namespace accelerators {
+
+typedef test::AshTestBase AcceleratorCommandsTest;
+
+TEST_F(AcceleratorCommandsTest, ToggleMinimized) {
+  scoped_ptr<aura::Window> window(
+      CreateTestWindowInShellWithBounds(gfx::Rect(5, 5, 20, 20)));
+  wm::ActivateWindow(window.get());
+
+  ToggleMinimized();
+  EXPECT_TRUE(wm::IsWindowMinimized(window.get()));
+  EXPECT_FALSE(wm::IsWindowNormal(window.get()));
+
+  ToggleMinimized();
+  EXPECT_FALSE(wm::IsWindowMinimized(window.get()));
+  EXPECT_TRUE(wm::IsWindowNormal(window.get()));
+}
+
+}  // namespace accelerators
+}  // namespace ash
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index de85b561cb77eb..a9a5f9a9ff2283 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -9,6 +9,7 @@
 #include <iostream>
 #include <string>
 
+#include "ash/accelerators/accelerator_commands.h"
 #include "ash/accelerators/accelerator_table.h"
 #include "ash/ash_switches.h"
 #include "ash/caps_lock_delegate.h"
@@ -843,23 +844,8 @@ bool AcceleratorController::PerformAction(int action,
                                        internal::SnapSizer::RIGHT_EDGE);
       return true;
     }
-    case WINDOW_MINIMIZE: {
-      aura::Window* window = wm::GetActiveWindow();
-      // Attempt to restore the window that would be cycled through next from
-      // the launcher when there is no active window.
-      if (!window)
-        return HandleCycleWindowMRU(WindowCycleController::FORWARD, false);
-      // Disable the shortcut for minimizing full screen window due to
-      // crbug.com/131709, which is a crashing issue related to minimizing
-      // full screen pepper window.
-      if (!wm::IsWindowFullscreen(window) && wm::CanMinimizeWindow(window)) {
-        ash::Shell::GetInstance()->delegate()->RecordUserMetricsAction(
-            ash::UMA_MINIMIZE_PER_KEY);
-        wm::MinimizeWindow(window);
-        return true;
-      }
-      break;
-    }
+    case WINDOW_MINIMIZE:
+      return accelerators::ToggleMinimized();
     case TOGGLE_FULLSCREEN: {
       if (key_code == ui::VKEY_MEDIA_LAUNCH_APP2) {
         shell->delegate()->RecordUserMetricsAction(
diff --git a/ash/accelerators/accelerator_table.cc b/ash/accelerators/accelerator_table.cc
index e3902c792c399a..60b102fd87bb07 100644
--- a/ash/accelerators/accelerator_table.cc
+++ b/ash/accelerators/accelerator_table.cc
@@ -147,8 +147,6 @@ const AcceleratorData kAcceleratorData[] = {
   { true, ui::VKEY_OEM_4, ui::EF_ALT_DOWN, WINDOW_SNAP_LEFT },
   { true, ui::VKEY_OEM_6, ui::EF_ALT_DOWN, WINDOW_SNAP_RIGHT },
   { true, ui::VKEY_OEM_MINUS, ui::EF_ALT_DOWN, WINDOW_MINIMIZE },
-  // Convenience for users switching from Mac OS.
-  { true, ui::VKEY_M, ui::EF_CONTROL_DOWN, WINDOW_MINIMIZE },
   { true, ui::VKEY_OEM_PLUS, ui::EF_ALT_DOWN, TOGGLE_MAXIMIZED },
   { true, ui::VKEY_OEM_PLUS, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN,
     WINDOW_POSITION_CENTER },
diff --git a/ash/accelerators/accelerator_table.h b/ash/accelerators/accelerator_table.h
index 8c400cefc0d7eb..da5acdde7d3123 100644
--- a/ash/accelerators/accelerator_table.h
+++ b/ash/accelerators/accelerator_table.h
@@ -12,6 +12,32 @@
 
 namespace ash {
 
+// There are four classes of accelerators in Ash:
+//
+// Ash (OS) reserved:
+// * Neither packaged apps nor web pages can cancel.
+// * For example, Alt-Tab window cycling.
+// * See kReservedActions below.
+//
+// Ash (OS) non-reserved:
+// * Packaged apps can cancel but web pages cannot.
+// * For example, volume up and down.
+// * See kActionsAllowedInAppMode below.
+//
+// Browser reserved:
+// * Packaged apps can cancel but web pages cannot.
+// * For example, browser back and forward from first-row function keys.
+// * See IsReservedCommandOrKey() in
+//   chrome/browser/ui/browser_command_controller.cc.
+//
+// Browser non-reserved:
+// * Both packaged apps and web pages can cancel.
+// * For example, selecting tabs by number with Ctrl-1 to Ctrl-9.
+// * See kAcceleratorMap in chrome/browser/ui/views/accelerator_table.cc.
+//
+// In particular, there is not an accelerator processing pass for Ash after
+// the browser gets the accelerator.  See crbug.com/285308 for details.
+//
 // Please put if/def sections at the end of the bare section and keep the list
 // within each section in alphabetical order.
 enum AcceleratorAction {
diff --git a/ash/ash.gyp b/ash/ash.gyp
index 389bb121bd1767..6f17a00a9de5d7 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -47,6 +47,8 @@
       ],
       'sources': [
         # All .cc, .h under ash, except unittests
+        'accelerators/accelerator_commands.cc',
+        'accelerators/accelerator_commands.h',
         'accelerators/accelerator_controller.cc',
         'accelerators/accelerator_controller.h',
         'accelerators/accelerator_dispatcher.cc',
@@ -535,6 +537,8 @@
       'conditions': [
         ['OS=="mac"', {
           'sources/': [
+            ['exclude', 'accelerators/accelerator_commands.cc'],
+            ['exclude', 'accelerators/accelerator_commands.h'],
             ['exclude', 'accelerators/accelerator_controller.cc'],
             ['exclude', 'accelerators/accelerator_controller.h'],
             ['exclude', 'accelerators/accelerator_dispatcher.cc'],
@@ -679,6 +683,7 @@
         '../ui/compositor/test/layer_animator_test_controller.h',
         '../ui/views/test/test_views_delegate.cc',
         '../ui/views/test/test_views_delegate.h',
+        'accelerators/accelerator_commands_unittest.cc',
         'accelerators/accelerator_controller_unittest.cc',
         'accelerators/accelerator_filter_unittest.cc',
         'accelerators/accelerator_table_unittest.cc',
diff --git a/chrome/browser/ui/browser_command_controller.cc b/chrome/browser/ui/browser_command_controller.cc
index 07e1822251d5df..b91d63fa662b45 100644
--- a/chrome/browser/ui/browser_command_controller.cc
+++ b/chrome/browser/ui/browser_command_controller.cc
@@ -51,6 +51,7 @@
 #endif
 
 #if defined(USE_ASH)
+#include "ash/accelerators/accelerator_commands.h"
 #include "chrome/browser/ui/ash/ash_util.h"
 #endif
 
@@ -444,6 +445,11 @@ void BrowserCommandController::ExecuteCommandWithDisposition(
     case IDC_TOGGLE_ASH_DESKTOP:
       chrome::ToggleAshDesktop();
       break;
+    case IDC_MINIMIZE_WINDOW:
+      ash::accelerators::ToggleMinimized();
+      break;
+    // If Ash needs many more commands here we should implement a general
+    // mechanism to pass accelerators back into Ash. http://crbug.com/285308
 #endif
 
 #if defined(OS_WIN)
@@ -836,6 +842,9 @@ void BrowserCommandController::InitCommandState() {
       chrome::HOST_DESKTOP_TYPE_NATIVE != chrome::HOST_DESKTOP_TYPE_ASH)
     command_updater_.UpdateCommandEnabled(IDC_TOGGLE_ASH_DESKTOP, true);
 #endif
+#if defined(USE_ASH)
+  command_updater_.UpdateCommandEnabled(IDC_MINIMIZE_WINDOW, true);
+#endif
 
   // Page-related commands
   command_updater_.UpdateCommandEnabled(IDC_EMAIL_PAGE_LOCATION, true);
diff --git a/chrome/browser/ui/views/accelerator_table.cc b/chrome/browser/ui/views/accelerator_table.cc
index 9115bd8835e2b8..5b84d1e08d9841 100644
--- a/chrome/browser/ui/views/accelerator_table.cc
+++ b/chrome/browser/ui/views/accelerator_table.cc
@@ -123,6 +123,8 @@ const AcceleratorMapping kAcceleratorMap[] = {
   { ui::VKEY_BROWSER_REFRESH, ui::EF_SHIFT_DOWN, IDC_RELOAD_IGNORING_CACHE },
   { ui::VKEY_BROWSER_FAVORITES, ui::EF_NONE, IDC_SHOW_BOOKMARK_MANAGER },
   { ui::VKEY_BROWSER_STOP, ui::EF_NONE, IDC_STOP },
+  // Not implemented inside Ash to allow web pages to capture the key.
+  { ui::VKEY_M, ui::EF_CONTROL_DOWN, IDC_MINIMIZE_WINDOW },
 #else  // OS_CHROMEOS
   { ui::VKEY_DELETE, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
     IDC_CLEAR_BROWSING_DATA },