Make SingleThreadProxy a SchedulerClient

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"
 #include "base/logging.h"
@@ skipping 191 matching lines @@
           base::Bind(&Scheduler::ProcessScheduledActions,
                      base::Unretained(this)));
     } else {
       advance_commit_state_timer_.Stop();
     }
   }
 }
 
 void Scheduler::BeginImplFrame(const BeginFrameArgs& args) {
   TRACE_EVENT0("cc", "Scheduler::BeginImplFrame");
-  DCHECK(state_machine_.begin_impl_frame_state() ==
-         SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_IDLE);
+  DCHECK_EQ(state_machine_.begin_impl_frame_state(),
+            SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_IDLE);
   DCHECK(state_machine_.HasInitializedOutputSurface());
   last_begin_impl_frame_args_ = args;
   last_begin_impl_frame_args_.deadline -= client_->DrawDurationEstimate();
   state_machine_.OnBeginImplFrame(last_begin_impl_frame_args_);
   devtools_instrumentation::DidBeginFrame(layer_tree_host_id_);
 
   if (settings_.switch_to_low_latency_if_possible) {
     state_machine_.SetSkipBeginMainFrameToReduceLatency(
         state_machine_.MainThreadIsInHighLatencyMode() &&
             CanCommitAndActivateBeforeDeadline());
@@ skipping 162 matching lines @@
   // impl thread's deadline.
   base::TimeTicks estimated_draw_time =
       last_begin_impl_frame_args_.frame_time +
       client_->BeginMainFrameToCommitDurationEstimate() +
       client_->CommitToActivateDurationEstimate();
 
   return estimated_draw_time < last_begin_impl_frame_args_.deadline;
 }
 
 }  // namespace cc