Add latency measurement system

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index f50e9184dfc804a0d2c76920c890fa3412b6a6cc..4265d3c39d9c787af57929b8128da0e3619a0699 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -6,6 +6,7 @@
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <map>
+#include <queue>
 #include <vector>
 
 #include "base/callback.h"
@@ -27,6 +28,7 @@
 #include "ui/compositor/compositor_observer.h"
 #include "ui/gfx/display_observer.h"
 #include "ui/gfx/rect.h"
+#include "webkit/compositor_bindings/web_latency_info_impl.h"
 #include "webkit/glue/webcursor.h"
 
 namespace aura {
@@ -233,6 +235,8 @@ class RenderWidgetHostViewAura
   virtual void OnCompositingAborted(ui::Compositor* compositor) OVERRIDE;
   virtual void OnCompositingLockStateChanged(
       ui::Compositor* compositor) OVERRIDE;
+  virtual void OnReceivedLatencyInfo(ui::Compositor* compositor,
+      const WebKit::WebLatencyInfoImpl& latency_info) OVERRIDE;
 
   // Overridden from ImageTransportFactoryObserver:
   virtual void OnLostResources() OVERRIDE;
@@ -438,6 +442,14 @@ class RenderWidgetHostViewAura
   };
   CanLockCompositorState can_lock_compositor_;
 
+  struct FrameLatency {
+    WebKit::WebLatencyInfoImpl latency_info;
+    int route_id;
+    int gpu_host_id;
+  };
+
+  std::queue<FrameLatency> frame_queue_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };