diff --git a/gfx/angle/include/EGL/eglext.h b/gfx/angle/include/EGL/eglext.h
index 9e29605cf0eec..6033404564b66 100644
--- a/gfx/angle/include/EGL/eglext.h
+++ b/gfx/angle/include/EGL/eglext.h
@@ -458,6 +458,11 @@ EGLAPI EGLBoolean EGLAPIENTRY eglQuerySurfacePointerANGLE (EGLDisplay dpy, EGLSu
 #define EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE 0x3208
 #endif /* EGL_ANGLE_platform_angle_opengl */
 
+#ifndef EGL_ANGLE_keyed_mutex
+#define EGL_ANGLE_keyed_mutex 1
+#define EGL_DXGI_KEYED_MUTEX_ANGLE 0x3209
+#endif /* EGL_ANGLE_keyed_mutex */
+
 #ifndef EGL_ARM_pixmap_multisample_discard
 #define EGL_ARM_pixmap_multisample_discard 1
 #define EGL_DISCARD_SAMPLES_ARM           0x3286
diff --git a/gfx/angle/src/libEGL/libEGL.cpp b/gfx/angle/src/libEGL/libEGL.cpp
index 1b08466a7ec56..8a5c9f60856d6 100644
--- a/gfx/angle/src/libEGL/libEGL.cpp
+++ b/gfx/angle/src/libEGL/libEGL.cpp
@@ -495,6 +495,12 @@ EGLBoolean __stdcall eglQuerySurfacePointerANGLE(EGLDisplay dpy, EGLSurface surf
             *value = (void*) (swapchain ? swapchain->getShareHandle() : NULL);
         }
         break;
+      case EGL_DXGI_KEYED_MUTEX_ANGLE:
+        {
+            rx::SwapChain *swapchain = eglSurface->getSwapChain();
+            *value = (void*) (swapchain ? swapchain->getKeyedMutex() : NULL);
+        }
+        break;
       default:
         return egl::error(EGL_BAD_ATTRIBUTE, EGL_FALSE);
     }
diff --git a/gfx/angle/src/libGLESv2/moz.build b/gfx/angle/src/libGLESv2/moz.build
index b45bec4b448ee..e2b58c428d059 100644
--- a/gfx/angle/src/libGLESv2/moz.build
+++ b/gfx/angle/src/libGLESv2/moz.build
@@ -171,10 +171,11 @@ if CONFIG['MOZ_HAS_WINSDK_WITH_D3D']:
         'renderer/d3d/d3d11/RenderStateCache.cpp',
         'renderer/d3d/d3d11/RenderTarget11.cpp',
         'renderer/d3d/d3d11/ShaderExecutable11.cpp',
-        'renderer/d3d/d3d11/SwapChain11.cpp',
         'renderer/d3d/d3d11/TextureStorage11.cpp',
         'renderer/d3d/d3d11/VertexBuffer11.cpp',
     ]
+    SOURCES += ['renderer/d3d/d3d11/SwapChain11.cpp']
+    SOURCES['renderer/d3d/d3d11/SwapChain11.cpp'].flags += ['-DANGLE_RESOURCE_SHARE_TYPE=D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX']
 
 
 if CONFIG['GNU_CXX']:
diff --git a/gfx/angle/src/libGLESv2/renderer/SwapChain.h b/gfx/angle/src/libGLESv2/renderer/SwapChain.h
index e742cc3b77523..f985fd9a94a4b 100644
--- a/gfx/angle/src/libGLESv2/renderer/SwapChain.h
+++ b/gfx/angle/src/libGLESv2/renderer/SwapChain.h
@@ -40,6 +40,7 @@ class SwapChain
     virtual void recreate() = 0;
 
     virtual HANDLE getShareHandle() {return mShareHandle;};
+    virtual void* getKeyedMutex() {return NULL;};
 
   protected:
     rx::NativeWindow mNativeWindow;  // Handler for the Window that the surface is created for.
diff --git a/gfx/angle/src/libGLESv2/renderer/d3d/d3d11/SwapChain11.cpp b/gfx/angle/src/libGLESv2/renderer/d3d/d3d11/SwapChain11.cpp
index 021b8e204d27d..6faa8009fbdc7 100644
--- a/gfx/angle/src/libGLESv2/renderer/d3d/d3d11/SwapChain11.cpp
+++ b/gfx/angle/src/libGLESv2/renderer/d3d/d3d11/SwapChain11.cpp
@@ -17,6 +17,11 @@
 
 #include "common/NativeWindow.h"
 
+// This can be defined to other values like D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX as needed
+#ifndef ANGLE_RESOURCE_SHARE_TYPE
+#define ANGLE_RESOURCE_SHARE_TYPE D3D11_RESOURCE_MISC_SHARED
+#endif
+
 namespace rx
 {
 
@@ -26,6 +31,7 @@ SwapChain11::SwapChain11(Renderer11 *renderer, rx::NativeWindow nativeWindow, HA
       SwapChain(nativeWindow, shareHandle, backBufferFormat, depthBufferFormat)
 {
     mSwapChain = NULL;
+    mKeyedMutex = NULL;
     mBackBufferTexture = NULL;
     mBackBufferRTView = NULL;
     mOffscreenTexture = NULL;
@@ -54,6 +60,7 @@ SwapChain11::~SwapChain11()
 void SwapChain11::release()
 {
     SafeRelease(mSwapChain);
+    SafeRelease(mKeyedMutex);
     SafeRelease(mBackBufferTexture);
     SafeRelease(mBackBufferRTView);
     SafeRelease(mOffscreenTexture);
@@ -161,7 +168,7 @@ EGLint SwapChain11::resetOffscreenTexture(int backbufferWidth, int backbufferHei
         offscreenTextureDesc.Usage = D3D11_USAGE_DEFAULT;
         offscreenTextureDesc.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE;
         offscreenTextureDesc.CPUAccessFlags = 0;
-        offscreenTextureDesc.MiscFlags = useSharedResource ? D3D11_RESOURCE_MISC_SHARED : 0;
+        offscreenTextureDesc.MiscFlags = useSharedResource ? ANGLE_RESOURCE_SHARE_TYPE : 0;
 
         HRESULT result = device->CreateTexture2D(&offscreenTextureDesc, NULL, &mOffscreenTexture);
 
@@ -205,6 +212,18 @@ EGLint SwapChain11::resetOffscreenTexture(int backbufferWidth, int backbufferHei
                 }
             }
         }
+        IDXGIKeyedMutex *keyedMutex = NULL;
+        result = mOffscreenTexture->QueryInterface(__uuidof(IDXGIKeyedMutex), (void**)&keyedMutex);
+
+        if (FAILED(result))
+        {
+            mKeyedMutex = NULL;
+        }
+        else
+        {
+            mKeyedMutex = keyedMutex;
+        }
+
     }
 
 
diff --git a/gfx/angle/src/libGLESv2/renderer/d3d/d3d11/SwapChain11.h b/gfx/angle/src/libGLESv2/renderer/d3d/d3d11/SwapChain11.h
index ae2e350adbb39..781a11f137204 100644
--- a/gfx/angle/src/libGLESv2/renderer/d3d/d3d11/SwapChain11.h
+++ b/gfx/angle/src/libGLESv2/renderer/d3d/d3d11/SwapChain11.h
@@ -38,6 +38,7 @@ class SwapChain11 : public SwapChain
 
     EGLint getWidth() const { return mWidth; }
     EGLint getHeight() const { return mHeight; }
+    virtual void* getKeyedMutex() { return mKeyedMutex; };
 
     static SwapChain11 *makeSwapChain11(SwapChain *swapChain);
 
@@ -57,6 +58,7 @@ class SwapChain11 : public SwapChain
     bool mPassThroughResourcesInit;
 
     IDXGISwapChain *mSwapChain;
+    IDXGIKeyedMutex *mKeyedMutex;
 
     ID3D11Texture2D *mBackBufferTexture;
     ID3D11RenderTargetView *mBackBufferRTView;