MouseMove when the mouse is down to signal compositor priority

content/renderer/scheduler/renderer_scheduler_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_SCHEDULER_RENDERER_SCHEDULER_IMPL_H_
 #define CONTENT_RENDERER_SCHEDULER_RENDERER_SCHEDULER_IMPL_H_
 
 #include "base/atomicops.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
@@ skipping 117 matching lines @@
   scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
 
   base::Closure update_policy_closure_;
   CancelableClosureHolder end_idle_period_closure_;
 
   // Don't access current_policy_ directly, instead use SchedulerPolicy().
   Policy current_policy_;
 
   base::TimeTicks estimated_next_frame_begin_;
 
-  // The incoming_signals_lock_ mutex protects access to last_input_time_
-  // and write access to policy_may_need_update_.
+  // The incoming_signals_lock_ mutex protects access to last_input_time_,
+  // mouse_down_ and write access to policy_may_need_update_.
   base::Lock incoming_signals_lock_;
   base::TimeTicks last_input_time_;
+  bool mouse_down_;

[Sami, 2015/02/05 15:27:28]

This doesn't seem to be actually protected by the mutex.

[alex clarke (OOO till 29th), 2015/02/05 17:47:16]

Acknowledged.

   PollableNeedsUpdateFlag policy_may_need_update_;
 
   scoped_refptr<cc::TestNowSource> time_source_;
 
   base::WeakPtr<RendererSchedulerImpl> weak_renderer_scheduler_ptr_;
   base::WeakPtrFactory<RendererSchedulerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererSchedulerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_SCHEDULER_RENDERER_SCHEDULER_IMPL_H_