Added trace query code and wired tracing through BrowserProxy so tests can run traces.

base/base.gypi

 # Copyright (c) 2011 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 60 matching lines @@
           'debug/leak_tracker.h',
           'debug/profiler.cc',
           'debug/profiler.h',
           'debug/stack_trace.cc',
           'debug/stack_trace.h',
           'debug/stack_trace_posix.cc',
           'debug/stack_trace_win.cc',
           'debug/trace_event_win.cc',
           'debug/trace_event.cc',
           'debug/trace_event.h',
+          'debug/trace_event_test_utils.cc',
+          'debug/trace_event_test_utils.h',
           'dir_reader_fallback.h',
           'dir_reader_linux.h',
           'dir_reader_posix.h',
           'environment.cc',
           'environment.h',
           'file_path.cc',
           'file_path.h',
           'file_util.cc',
           'file_util.h',
           'file_util_deprecated.h',
@@ skipping 631 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }