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

cc/debug/frame_viewer_instrumentation.cc

 // 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.
 
 #include "cc/debug/frame_viewer_instrumentation.h"
 
 namespace cc {
 namespace frame_viewer_instrumentation {
+
+const char kCategoryLayerTree[] =
+    TRACE_DISABLED_BY_DEFAULT("cc.debug") ","
+    TRACE_DISABLED_BY_DEFAULT("cc.debug.quads") ","
+    TRACE_DISABLED_BY_DEFAULT("devtools.timeline.layers");
+
 namespace {
 
 const char kCategory[] = "cc," TRACE_DISABLED_BY_DEFAULT("devtools.timeline");
 const char kTileData[] = "tileData";
 const char kLayerId[] = "layerId";
 const char kTileId[] = "tileId";
 const char kTileResolution[] = "tileResolution";
 const char kSourceFrameNumber[] = "sourceFrameNumber";
 
 const char kAnalyzeTask[] = "AnalyzeTask";
@@ skipping 34 matching lines @@
                                    int layer_id) {
   TRACE_EVENT_BEGIN1(
       kCategory, kRasterTask, kTileData,
       TileDataAsValue(tile_id, tile_resolution, source_frame_number, layer_id));
 }
 
 ScopedRasterTask::~ScopedRasterTask() {
   TRACE_EVENT_END0(kCategory, kRasterTask);
 }
 
+bool IsTracingLayerTreeSnapshots() {
+  bool category_enabled;
+  TRACE_EVENT_CATEGORY_GROUP_ENABLED(kCategoryLayerTree, &category_enabled);
+  return category_enabled;
+}
+
 }  // namespace frame_viewer_instrumentation
 }  // namespace cc