Remove forced commit and readback from the scheduler.

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 1134 matching lines @@
   bool forced_draw = false;
   return DrawSwapInternal(forced_draw);
 }
 
 DrawResult ThreadProxy::ScheduledActionDrawAndSwapForced() {
   TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionDrawAndSwapForced");
   bool forced_draw = true;
   return DrawSwapInternal(forced_draw);
 }
 
-DrawResult ThreadProxy::ScheduledActionDrawAndReadback() {
-  TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionDrawAndReadback");
-  NOTREACHED();
-  return INVALID_RESULT;
-}
-
 void ThreadProxy::DidAnticipatedDrawTimeChange(base::TimeTicks time) {
   if (impl().current_resource_update_controller)
     impl().current_resource_update_controller->PerformMoreUpdates(time);
 }
 
 base::TimeDelta ThreadProxy::DrawDurationEstimate() {
   return impl().timing_history.DrawDurationEstimate();
 }
 
 base::TimeDelta ThreadProxy::BeginMainFrameToCommitDurationEstimate() {
@@ skipping 336 matching lines @@
 
   impl().timing_history.DidActivatePendingTree();
 }
 
 void ThreadProxy::DidManageTiles() {
   DCHECK(IsImplThread());
   impl().scheduler->DidManageTiles();
 }
 
 }  // namespace cc