[cc] Don't send missed BeginFrames with past deadline.

cc/scheduler/begin_frame_source.cc

 // Copyright 2014 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/begin_frame_source.h"
 
 #include <stddef.h>
 
 #include "base/atomic_sequence_num.h"
 #include "base/auto_reset.h"
@@ skipping 346 matching lines @@
   // Send a MISSED begin frame if necessary.
   if (missed_begin_frame_args_.IsValid()) {
     const BeginFrameArgs& last_args = obs->LastUsedBeginFrameArgs();
     if (!last_args.IsValid() ||
         (missed_begin_frame_args_.frame_time > last_args.frame_time)) {
       DCHECK((missed_begin_frame_args_.source_id != last_args.source_id) ||
              (missed_begin_frame_args_.sequence_number >
               last_args.sequence_number))
           << "current " << missed_begin_frame_args_.AsValue()->ToString()
           << ", last " << last_args.AsValue()->ToString();
-      obs->OnBeginFrame(missed_begin_frame_args_);
+      // Avoid issuing missed BeginFrames with a past deadline.
+      if (missed_begin_frame_args_.deadline.is_null() ||
+          missed_begin_frame_args_.deadline > Now()) {
+        obs->OnBeginFrame(missed_begin_frame_args_);
+      }
     }
   }
 }
 
 void ExternalBeginFrameSource::RemoveObserver(BeginFrameObserver* obs) {
   DCHECK(obs);
   DCHECK(observers_.find(obs) != observers_.end());
 
   observers_.erase(obs);
   ack_tracker_.OnObserverRemoved(obs);
@@ skipping 57 matching lines @@
 void ExternalBeginFrameSource::FinishFrame() {
   frame_active_ = false;
 
   BeginFrameAck ack(missed_begin_frame_args_.source_id,
                     missed_begin_frame_args_.sequence_number,
                     ack_tracker_.LatestConfirmedSequenceNumber(), 0,
                     ack_tracker_.AnyObserversHadDamage());
   client_->OnDidFinishFrame(ack);
 }
 
+base::TimeTicks ExternalBeginFrameSource::Now() const {
+  return base::TimeTicks::Now();
+}
+
 }  // namespace cc