cc: Add main frame timing info to frame timing tracker.

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index 51cc18cd95fc6c89d86f6b48c38cb818ea64a32b..a7875e5d81955314fb817cb4da0d0b4cffbf0254 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -143,6 +143,9 @@ class CC_EXPORT ThreadProxy : public Proxy,
 
     scoped_ptr<BeginFrameSource> external_begin_frame_source;
 
+    BeginFrameArgs last_begin_main_frame_args;
+    BeginFrameArgs last_begin_impl_frame_args;

[mithro-old, 2015/03/23 00:15:08]

We now have "animation_time", "last_begin_main_frame_args" and
"last_begin_impl_frame_args" here - I'm 100% sure people will end up using the
wrong values here. At a minimum put a comment that these values are only for
recording frame timing.

As Brian mentions I have a patch which should hopefully clean this up a bit,
will try and get that in ASAP.

[vmpstr, 2015/03/23 20:26:43]

Added a comment. I look forward to your patch landing.

+
     scoped_ptr<LayerTreeHostImpl> layer_tree_host_impl;
     base::WeakPtrFactory<ThreadProxy> weak_factory;
   };
@@ -284,6 +287,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
   void SetInputThrottledUntilCommitOnImplThread(bool is_throttled);
   void SetDebugStateOnImplThread(const LayerTreeDebugState& debug_state);
   void SetDeferCommitsOnImplThread(bool defer_commits) const;
+  void RecordMainFrameTiming();
 
   LayerTreeHost* layer_tree_host();
   const LayerTreeHost* layer_tree_host() const;