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

cc/debug/frame_viewer_instrumentation.cc

Index: cc/debug/frame_viewer_instrumentation.cc
diff --git a/cc/debug/frame_viewer_instrumentation.cc b/cc/debug/frame_viewer_instrumentation.cc
index 53c155166b8b3f5f21549d12e88e226945b606d8..8efc7e7680a07e4d532ce7e8d96174ce94532354 100644
--- a/cc/debug/frame_viewer_instrumentation.cc
+++ b/cc/debug/frame_viewer_instrumentation.cc
@@ -4,11 +4,18 @@
 
 #include "cc/debug/frame_viewer_instrumentation.h"
 
+#include "cc/trees/layer_tree_host_impl.h"
+
 namespace cc {
 namespace frame_viewer_instrumentation {
 namespace {
 
 const char kCategory[] = "cc," TRACE_DISABLED_BY_DEFAULT("devtools.timeline");
+const char kCategoryLayerTree[] =
+    TRACE_DISABLED_BY_DEFAULT("cc.debug") ","
+    TRACE_DISABLED_BY_DEFAULT("cc.debug.quads") ","
+    TRACE_DISABLED_BY_DEFAULT("devtools.timeline.layers");
+
 const char kTileData[] = "tileData";
 const char kLayerId[] = "layerId";
 const char kTileId[] = "tileId";
@@ -60,5 +67,19 @@ ScopedRasterTask::~ScopedRasterTask() {
   TRACE_EVENT_END0(kCategory, kRasterTask);
 }
 
+bool IsTracingLayerTreeSnapshots() {
+  bool category_enabled;
+  TRACE_EVENT_CATEGORY_GROUP_ENABLED(kCategoryLayerTree, &category_enabled);
+  return category_enabled;
+}
+
+void TraceLayerTreeSnapshot(LayerTreeHostImpl* layer_tree_host_impl,
+                            FrameData* frame) {
+  TRACE_EVENT0("cc", "DrawLayers.FrameViewerTracing");

[danakj, 2015/03/16 19:06:49]

Can you make this trace event name more like the function name it's found in?

+  TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
+      kCategoryLayerTree, "cc::LayerTreeHostImpl", layer_tree_host_impl->id(),
+      layer_tree_host_impl->AsValueWithFrame(frame));
+}
+
 }  // namespace frame_viewer_instrumentation
 }  // namespace cc