Add py_trace_event to DEPS.

py_trace_event lets you instrument Python code to get Chrome traces.
In third_party without a README.chromium, because
it's by Chromium authors and Chromium-licensed.

BUG=None.
TEST=gclient sync

Review URL: https://codereview.chromium.org/615363002

Cr-Commit-Position: refs/heads/master@{#297736}

.gitignore

@@ -309,6 +309,7 @@ v8.log
 /third_party/ppapi
 /third_party/psyco_win32
 /third_party/pthreads-win32
+/third_party/py_trace_event/src
 /third_party/pyelftools
 /third_party/pyftpdlib/src
 /third_party/pylib

DEPS

@@ -300,6 +300,9 @@ deps = {
 
   'src/third_party/boringssl/src':
    'https://boringssl.googlesource.com/boringssl.git' + '@' +  Var('boringssl_revision'),
+
+  'src/third_party/py_trace_event/src':
+    Var('chromium_git') + '/external/py_trace_event.git' + '@' + 'dd463ea9e2c430de2b9e53dea57a77b4c3ac9b30',
 }
 
 

third_party/py_trace_event/OWNERS

@@ -0,0 +1,2 @@
+nduca@chromium.org
+dtu@chromium.org

third_party/py_trace_event/README.chromium

@@ -0,0 +1,21 @@
+Name: py_trace_event
+URL: https://github.com/natduca/py_trace_event
+Version: 0
+Date: August 18, 2014
+Revision: dd463ea9e2c430de2b9e53dea57a77b4c3ac9b30
+License: BSD
+License File: src/LICENSE
+Security Critical: no
+License Android Compatible: yes
+
+Description:
+py_trace_event allows low-overhead instrumentation of a multi-threaded,
+multi-process application in order to study its global performance
+characteristics. It uses the trace event format used in Chromium/Chrome's
+about:tracing system.
+
+Trace files generated by py_trace_event can be viewed and manipulated by
+trace_event_viewer.
+
+Local Modifications:
+None.

tools/telemetry/telemetry/util/trace.py

@@ -0,0 +1,10 @@
+# Copyright 2014 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.
+
+from telemetry.core import util
+
+
+util.AddDirToPythonPath(util.GetChromiumSrcDir(),
+                        'third_party', 'py_trace_event', 'src')
+from trace_event import *  # pylint: disable=F0401