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

cc/scheduler/scheduler.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/scheduler/scheduler.h"
 
 #include <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
@@ skipping 306 matching lines @@
       begin_impl_frame_args_.interval <= base::TimeDelta())
     return base::TimeTicks();
 
   base::TimeTicks now = Now();
   base::TimeTicks timebase = std::max(begin_impl_frame_args_.frame_time,
                                       begin_impl_frame_args_.deadline);
   int64 intervals = 1 + ((now - timebase) / begin_impl_frame_args_.interval);
   return timebase + (begin_impl_frame_args_.interval * intervals);
 }
 
-base::TimeTicks Scheduler::LastBeginImplFrameTime() {
+base::TimeTicks Scheduler::LastBeginImplFrameTime() const {
   return begin_impl_frame_args_.frame_time;
 }
 
+base::TimeTicks Scheduler::NextBeginImplFrameTimeIfRequested() const {
+  return begin_impl_frame_args_.frame_time + begin_impl_frame_args_.interval;

[vmpstr, 2015/02/11 22:42:49]

+brianderson, you mentioned that this might not be correct in webview right now.
Is there a bug out there to track/fix this? Or is there a better way of getting
this information? I want to add a TODO or something like that, but I'm kind of
missing context.

+}
+
 void Scheduler::SetupNextBeginFrameIfNeeded() {
   if (!task_runner_.get())
     return;
 
   if (state_machine_.ShouldSetNeedsBeginFrames(
           frame_source_->NeedsBeginFrames())) {
     frame_source_->SetNeedsBeginFrames(state_machine_.BeginFrameNeeded());
   }
 
   if (state_machine_.begin_impl_frame_state() ==
@@ skipping 477 matching lines @@
 }
 
 bool Scheduler::IsBeginMainFrameSentOrStarted() const {
   return (state_machine_.commit_state() ==
               SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_SENT ||
           state_machine_.commit_state() ==
               SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_STARTED);
 }
 
 }  // namespace cc