Route selection bounds updates through the compositor

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 8ed0c4029a8f44acdf8cd6004cbf9256c683cac5..de708fc1625884dfed15106169112552e5f5c57f 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -243,7 +243,8 @@ class CONTENT_EXPORT RenderWidget
   // the new value will be sent to the browser process.
   void UpdateSelectionBounds();
 
-  virtual void GetSelectionBounds(gfx::Rect* start, gfx::Rect* end);
+  // Returns false if the selection bounds should not be updated.
+  virtual bool GetSelectionBounds(gfx::Rect* start, gfx::Rect* end);
 
   void OnShowHostContextMenu(ContextMenuParams* params);
 
@@ -624,6 +625,7 @@ class CONTENT_EXPORT RenderWidget
   // Stores the current selection bounds.
   gfx::Rect selection_focus_rect_;
   gfx::Rect selection_anchor_rect_;
+  bool enable_composited_selection_bounds_;
 
   // Stores the current composition character bounds.
   std::vector<gfx::Rect> composition_character_bounds_;