Chromium plumbing to use the selection root bounds.

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 fdd55c3cd70c044aff22dca7ff5e4c2247778050..cb398f17c7e5b6dfe9ffe9a2f0a628ee696605fe 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -232,6 +232,10 @@ class CONTENT_EXPORT RenderWidget
   // the new value will be sent to the browser process.
   void UpdateSelectionBounds();
 
+  // Checks if the selection root bounds have changed. If they have changed, the
+  // new value will be sent to the browser process.
+  void UpdateSelectionRootBounds();
+
   void OnShowHostContextMenu(ContextMenuParams* params);
 
 #if defined(OS_MACOSX) || defined(OS_WIN) || defined(USE_AURA)
@@ -456,6 +460,7 @@ class CONTENT_EXPORT RenderWidget
   // position.
   virtual ui::TextInputType GetTextInputType();
   virtual void GetSelectionBounds(gfx::Rect* start, gfx::Rect* end);
+  virtual void GetSelectionRootBounds(gfx::Rect* bounds);
   virtual ui::TextInputType WebKitToUiTextInputType(
       blink::WebTextInputType type);
 
@@ -675,6 +680,9 @@ class CONTENT_EXPORT RenderWidget
   gfx::Rect selection_focus_rect_;
   gfx::Rect selection_anchor_rect_;
 
+  // Stores the current selection root bounds.
+  gfx::Rect selection_root_rect_;
+
   // Stores the current composition character bounds.
   std::vector<gfx::Rect> composition_character_bounds_;