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

cc/trees/thread_proxy.cc

 // Copyright 2011 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/trees/thread_proxy.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 673 matching lines @@
 
   if (!impl().layer_tree_host_impl->settings().impl_side_painting) {
     DCHECK_GT(impl().layer_tree_host_impl->memory_allocation_limit_bytes(), 0u);
   }
   begin_main_frame_state->memory_allocation_limit_bytes =
       impl().layer_tree_host_impl->memory_allocation_limit_bytes();
   begin_main_frame_state->memory_allocation_priority_cutoff =
       impl().layer_tree_host_impl->memory_allocation_priority_cutoff();
   begin_main_frame_state->evicted_ui_resources =
       impl().layer_tree_host_impl->EvictedUIResourcesExist();
+  impl().layer_tree_host_impl->SetBeginMainFrameTime(

[enne (OOO), 2015/03/10 00:32:29]

Can you rename this to be something other than "BeginMainFrameTime", and tie it
more to like "this value is passed to raf as the current time to animate at"?

[vmpstr, 2015/03/16 18:36:43]

Done.

+      impl().scheduler->LastBeginImplFrameTime());

[mithro-old, 2015/03/11 04:01:33]

What is LastBeginImplFrameTime here?

If it is as enne describes, then it is already stored in
begin_main_frame_state->begin_frame_args

[vmpstr, 2015/03/16 18:36:43]

Done.

   Proxy::MainThreadTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&ThreadProxy::BeginMainFrame,
                  main_thread_weak_ptr_,
                  base::Passed(&begin_main_frame_state)));
   devtools_instrumentation::DidRequestMainThreadFrame(
       impl().layer_tree_host_id);
   impl().timing_history.DidBeginMainFrame();
 }
 
@@ skipping 683 matching lines @@
   impl().scheduler->DidPrepareTiles();
 }
 
 void ThreadProxy::DidCompletePageScaleAnimationOnImplThread() {
   DCHECK(IsImplThread());
   Proxy::MainThreadTaskRunner()->PostTask(
       FROM_HERE, base::Bind(&ThreadProxy::DidCompletePageScaleAnimation,
                             main_thread_weak_ptr_));
 }
 
+base::TimeTicks ThreadProxy::GetNextBeginImplFrameTimeIfRequested() const {

[mithro-old, 2015/03/11 04:01:33]

What is this used for?

[vmpstr, 2015/03/16 18:36:43]

This plumbs the next predicted raf time to lthi via the client interface.

+  DCHECK(IsImplThread());
+  return impl().scheduler->NextBeginImplFrameTimeIfRequested();
+}
+
 }  // namespace cc