CC: Force push properties for all layers when tracing is started

cc/debug/frame_viewer_instrumentation.h

 // 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.
 
 #ifndef CC_DEBUG_FRAME_VIEWER_INSTRUMENTATION_H_
 #define CC_DEBUG_FRAME_VIEWER_INSTRUMENTATION_H_
 
 #include "base/trace_event/trace_event.h"
 #include "cc/resources/tile.h"
 
 namespace cc {
 namespace frame_viewer_instrumentation {
 
+extern const char kCategoryLayerTree[];
+
 class ScopedAnalyzeTask {
  public:
   ScopedAnalyzeTask(const void* tile_id,
                     TileResolution tile_resolution,
                     int source_frame_number,
                     int layer_id);
   ~ScopedAnalyzeTask();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScopedAnalyzeTask);
 };
 
 class ScopedRasterTask {
  public:
   ScopedRasterTask(const void* tile_id,
                    TileResolution tile_resolution,
                    int source_frame_number,
                    int layer_id);
   ~ScopedRasterTask();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScopedRasterTask);
 };
 
+bool IsTracingLayerTreeSnapshots();
+
 }  // namespace frame_viewer_instrumentation
 }  // namespace cc
 
 #endif  // CC_DEBUG_FRAME_VIEWER_INSTRUMENTATION_H_