Adds BeginFrameControl via DevTools.

content/browser/web_contents/web_contents_view_aura.cc

Index: content/browser/web_contents/web_contents_view_aura.cc
diff --git a/content/browser/web_contents/web_contents_view_aura.cc b/content/browser/web_contents/web_contents_view_aura.cc
index dc643ee5836a2fa109f292b6e173076f5eef6d16..5b04e35b2470aeb76579d7b14eb42f2945a1a20b 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -851,6 +851,10 @@ void WebContentsViewAura::SetOverscrollControllerEnabled(bool enabled) {
   }
 }
 
+ui::Compositor* WebContentsViewAura::GetCompositor() const {
+  return window_ ? window_->GetHost()->compositor() : nullptr;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsViewAura, RenderViewHostDelegateView implementation: