Update from https://crrev.com/312398

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/debug/trace_event.h"
@@ skipping 543 matching lines @@
 
   begin_impl_frame_args_ = args;
   begin_impl_frame_args_.deadline -= client_->DrawDurationEstimate();
 
   if (!state_machine_.impl_latency_takes_priority() &&
       main_thread_is_in_high_latency_mode &&
       CanCommitAndActivateBeforeDeadline()) {
     state_machine_.SetSkipNextBeginMainFrameToReduceLatency();
   }
 
-  client_->WillBeginImplFrame(begin_impl_frame_args_);
   state_machine_.OnBeginImplFrame(begin_impl_frame_args_);
   devtools_instrumentation::DidBeginFrame(layer_tree_host_id_);
+  client_->WillBeginImplFrame(begin_impl_frame_args_);
 
   ProcessScheduledActions();
 
   state_machine_.OnBeginImplFrameDeadlinePending();
 
   if (settings_.using_synchronous_renderer_compositor) {
     // The synchronous renderer compositor has to make its GL calls
     // within this call.
     // TODO(brianderson): Have the OutputSurface initiate the deadline tasks
     // so the synchronous renderer compositor can take advantage of splitting
@@ skipping 233 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