MacViews: Implement Force Touch/Mac dictionary lookup for Textfields.

ui/views/view.h

Index: ui/views/view.h
diff --git a/ui/views/view.h b/ui/views/view.h
index 55cc02bb54da4eaa205df9f8adc17d5f84245279..553903d0206c984773e0906f05c91d4284bf6e3a 100644
--- a/ui/views/view.h
+++ b/ui/views/view.h
@@ -49,6 +49,7 @@ namespace gfx {
 class Canvas;
 class Insets;
 class Path;
+class RenderText;
 class Transform;
 }
 
@@ -573,6 +574,10 @@ class VIEWS_EXPORT View : public ui::LayerDelegate,
   // NULL.
   virtual View* GetTooltipHandlerForPoint(const gfx::Point& point);
 
+  // Returns the RenderText instance corresponding to the view. Currently, only
+  // views which have at most one RenderText instance, should implement this.
+  virtual gfx::RenderText* GetRenderText();
+
   // Return the cursor that should be used for this view or the default cursor.
   // The event location is in the receiver's coordinate system. The caller is
   // responsible for managing the lifetime of the returned object, though that