Propagate source_frame_number from LTH to DevTools

content/test/web_layer_tree_view_impl_for_testing.h

Index: content/test/web_layer_tree_view_impl_for_testing.h
diff --git a/content/test/web_layer_tree_view_impl_for_testing.h b/content/test/web_layer_tree_view_impl_for_testing.h
index 311775605b8af23e1ad32f2562ed5590f12cad51..bf19cb4131bc522b9c5b639b39c65b78ac41ebcb 100644
--- a/content/test/web_layer_tree_view_impl_for_testing.h
+++ b/content/test/web_layer_tree_view_impl_for_testing.h
@@ -60,7 +60,7 @@ class WebLayerTreeViewImplForTesting
       blink::WebRenderingStats& stats) const;  // NOLINT(runtime/references)
 
   // cc::LayerTreeHostClient implementation.
-  virtual void WillBeginMainFrame() OVERRIDE {}
+  virtual void WillBeginMainFrame(int frame_id) OVERRIDE {}
   virtual void DidBeginMainFrame() OVERRIDE {}
   virtual void Animate(double frame_begin_time) OVERRIDE {}
   virtual void Layout() OVERRIDE;