Adds BeginFrameControl via DevTools.

content/browser/web_contents/web_contents_view.h

Index: content/browser/web_contents/web_contents_view.h
diff --git a/content/browser/web_contents/web_contents_view.h b/content/browser/web_contents/web_contents_view.h
index e4401f85bf3f6c18dfa9bcfd76ed3a6e24a723ef..ec7b2852a2a28d988a597101c2ca5bb0b1516033 100644
--- a/content/browser/web_contents/web_contents_view.h
+++ b/content/browser/web_contents/web_contents_view.h
@@ -14,6 +14,10 @@
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_widget_types.h"
 
+namespace ui {
+class Compositor;
+}
+
 namespace content {
 class RenderViewHost;
 class RenderWidgetHost;
@@ -115,6 +119,10 @@ class WebContentsView {
   // Invoked to enable/disable overscroll gesture navigation.
   virtual void SetOverscrollControllerEnabled(bool enabled) = 0;
 
+  // Returns the Compositor currently responsible for the view. Only supported
+  // on aura; is null on all other platforms.
+  virtual ui::Compositor* GetCompositor() const = 0;
+
 #if defined(OS_MACOSX)
   // Allowing other views disables optimizations which assume that only a single
   // WebContents is present.