Disable raf alignment when the compositor doesn't generate begin frames.

content/renderer/input/main_thread_event_queue.h

 // Copyright 2016 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.
 
 #ifndef CONTENT_RENDERER_INPUT_MAIN_THREAD_EVENT_QUEUE_H_
 #define CONTENT_RENDERER_INPUT_MAIN_THREAD_EVENT_QUEUE_H_
 
 #include <deque>
 #include "base/feature_list.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 63 matching lines @@
 //                  (deque)
 //                  (deque)
 //   <-------(ACK)------
 //
 class CONTENT_EXPORT MainThreadEventQueue
     : public base::RefCountedThreadSafe<MainThreadEventQueue> {
  public:
   MainThreadEventQueue(
       MainThreadEventQueueClient* client,
       const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner,
-      blink::scheduler::RendererScheduler* renderer_scheduler);
+      blink::scheduler::RendererScheduler* renderer_scheduler,
+      bool allow_raf_aligned_input);
 
   // Called once the compositor has handled |event| and indicated that it is
   // a non-blocking event to be queued to the main thread.
   bool HandleEvent(ui::WebScopedInputEvent event,
                    const ui::LatencyInfo& latency,
                    InputEventDispatchType dispatch_type,
                    InputEventAckState ack_result);
   void DispatchRafAlignedInput(base::TimeTicks frame_time);
   void QueueClosure(const base::Closure& closure);
 
@@ skipping 55 matching lines @@
 
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
   blink::scheduler::RendererScheduler* renderer_scheduler_;
 
   DISALLOW_COPY_AND_ASSIGN(MainThreadEventQueue);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_INPUT_MAIN_THREAD_EVENT_QUEUE_H_