cc: Fix incorrect deadline for low-latency mode.

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 561 matching lines @@
     ScheduleBeginImplFrameDeadline(
         AdjustedBeginImplFrameDeadline(args, draw_duration_estimate));
   }
 }
 
 base::TimeTicks Scheduler::AdjustedBeginImplFrameDeadline(
     const BeginFrameArgs& args,
     base::TimeDelta draw_duration_estimate) const {
   // The synchronous compositor does not post a deadline task.
   DCHECK(!settings_.using_synchronous_renderer_compositor);
-  if (settings_.main_thread_should_always_be_low_latency) {
-    // In main thread low latency mode, always start deadline early.
-    return base::TimeTicks();
-  } else if (state_machine_.ShouldTriggerBeginImplFrameDeadlineEarly()) {
+  if (state_machine_.ShouldTriggerBeginImplFrameDeadlineEarly()) {
     // We are ready to draw a new active tree immediately.
     // We don't use Now() here because it's somewhat expensive to call.
     return base::TimeTicks();
   } else if (settings_.main_thread_should_always_be_low_latency) {
     // Post long deadline to keep advancing during idle period. After activation
     // we will be able to trigger deadline early.
     // TODO(weiliangc): Don't post deadline once input is deferred with
     // BeginRetroFrames.
     return args.frame_time + args.interval;
   } else if (state_machine_.needs_redraw()) {
@@ skipping 207 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