cc: Abstract out proxy timing history

cc/trees/thread_proxy.h

 // 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.
 
 #ifndef CC_TREES_THREAD_PROXY_H_
 #define CC_TREES_THREAD_PROXY_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "cc/animation/animation_events.h"
 #include "cc/base/completion_event.h"
-#include "cc/base/rolling_time_delta_history.h"
 #include "cc/resources/resource_update_controller.h"
 #include "cc/scheduler/scheduler.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/proxy.h"
+#include "cc/trees/proxy_timing_history.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace cc {
 
 class ContextProvider;
 class InputHandlerClient;
 class LayerTreeHost;
@@ skipping 260 matching lines @@
 
     bool input_throttled_until_commit;
 
     // Set when we freeze animations to avoid checkerboarding.
     bool animations_frozen_until_next_draw;
     base::TimeTicks animation_freeze_time;
 
     base::TimeTicks smoothness_takes_priority_expiration_time;
     bool renew_tree_priority_pending;
 
-    RollingTimeDeltaHistory draw_duration_history;
-    RollingTimeDeltaHistory begin_main_frame_to_commit_duration_history;
-    RollingTimeDeltaHistory commit_to_activate_duration_history;
-
-    // Used for computing samples added to
-    // begin_main_frame_to_commit_duration_history_ and
-    // activation_duration_history_.
-    base::TimeTicks begin_main_frame_sent_time;
-    base::TimeTicks commit_complete_time;
+    ProxyTimingHistory timing_history;
 
     scoped_ptr<LayerTreeHostImpl> layer_tree_host_impl;
     base::WeakPtrFactory<ThreadProxy> weak_factory;
   };
   // Use accessors instead of this variable directly.
   CompositorThreadOnly compositor_thread_vars_unsafe_;
   CompositorThreadOnly& impl();
   const CompositorThreadOnly& impl() const;
 
   base::WeakPtr<ThreadProxy> main_thread_weak_ptr_;
   base::WeakPtr<ThreadProxy> impl_thread_weak_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadProxy);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_THREAD_PROXY_H_