cc: add more devtools instrumentation

cc/debug/devtools_instrumentation.h

Index: cc/debug/devtools_instrumentation.h
diff --git a/cc/debug/devtools_instrumentation.h b/cc/debug/devtools_instrumentation.h
index 3caa81ea6d545f06efd2c8550fbd9ea55f26bdb7..6afc35d4f093a598927e9bfc479b5bccbcfab781 100644
--- a/cc/debug/devtools_instrumentation.h
+++ b/cc/debug/devtools_instrumentation.h
@@ -20,6 +20,8 @@ const char kPixelRefId[] = "pixelRefId";
 const char kImageDecodeTask[] = "ImageDecodeTask";
 const char kBeginFrame[] = "BeginFrame";
 const char kActivateLayerTree[] = "ActivateLayerTree";
+const char kRequestMainThreadFrame[] = "RequestMainThreadFrame";
+const char kDrawFrame[] = "DrawFrame";
 }  // namespace internal
 
 const char kRasterTask[] = "RasterTask";
@@ -101,6 +103,22 @@ inline void didBeginFrame(int layer_tree_host_id) {
                        internal::kLayerTreeId, layer_tree_host_id);
 }
 
+inline void didDrawFrame(int layer_tree_host_id) {

[danakj, 2014/02/11 17:58:13]

why do functions in this file have webkit style names?

+  TRACE_EVENT_INSTANT1(internal::kCategory,
+                       internal::kDrawFrame,
+                       TRACE_EVENT_SCOPE_THREAD,
+                       internal::kLayerTreeId,
+                       layer_tree_host_id);
+}
+
+inline void didRequestMainThreadFrame(int layer_tree_host_id) {
+  TRACE_EVENT_INSTANT1(internal::kCategory,
+                       internal::kRequestMainThreadFrame,
+                       TRACE_EVENT_SCOPE_THREAD,
+                       internal::kLayerTreeId,
+                       layer_tree_host_id);
+}
+
 }  // namespace devtools_instrumentation
 }  // namespace cc