cc: Make PrepareToDraw return an enum for why it aborts

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 282 matching lines @@
   TRACE_EVENT0("cc", "Scheduler::PollForAnticipatedDrawTriggers");
   poll_for_draw_triggers_closure_.Cancel();
   state_machine_.DidEnterPollForAnticipatedDrawTriggers();
   ProcessScheduledActions();
   state_machine_.DidLeavePollForAnticipatedDrawTriggers();
 }
 
 void Scheduler::DrawAndSwapIfPossible() {
   DrawSwapReadbackResult result =
       client_->ScheduledActionDrawAndSwapIfPossible();
-  state_machine_.DidDrawIfPossibleCompleted(result.did_draw);
+  state_machine_.DidDrawIfPossibleCompleted(result.draw_result);
 }
 
 void Scheduler::DrawAndSwapForced() {
   client_->ScheduledActionDrawAndSwapForced();
 }
 
 void Scheduler::DrawAndReadback() {
   DrawSwapReadbackResult result = client_->ScheduledActionDrawAndReadback();
   DCHECK(!result.did_swap);
 }
@@ skipping 73 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