Adds selection expansion support for Contextual Search.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index d28a53ca87dcfe72e0a48df788b4c8b534881998..31e3f7ffb75e9d98b392e570936ed2da1d0bed86 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -641,6 +641,7 @@ class CONTENT_EXPORT RenderFrameImpl
   void OnDelete();
   void OnSelectAll();
   void OnSelectRange(const gfx::Point& base, const gfx::Point& extent);
+  void OnAdjustSelectionByCharacterOffset(int start_adjust, int end_adjust);
   void OnUnselect();
   void OnMoveRangeSelectionExtent(const gfx::Point& point);
   void OnReplace(const base::string16& text);