Implement touch selection for RWHVV.

content/renderer/render_view.h

Index: content/renderer/render_view.h
diff --git a/content/renderer/render_view.h b/content/renderer/render_view.h
index 0db56159c59f059d08cb67a305904d0e979d55b0..a51a4a939152160f3801c04300a4f2a427167fe4 100644
--- a/content/renderer/render_view.h
+++ b/content/renderer/render_view.h
@@ -819,6 +819,7 @@ class RenderView : public RenderWidget,
                            int id,
                            bool notify_result);
   void OnSelectAll();
+  void OnSelectRect(const gfx::Point& start, const gfx::Point& end);
   void OnSetAccessibilityFocus(int acc_obj_id);
   void OnSetActive(bool active);
   void OnSetAltErrorPageURL(const GURL& gurl);
@@ -1197,6 +1198,14 @@ class RenderView : public RenderWidget,
   // is fine.
   ObserverList<RenderViewObserver> observers_;
 
+  // Set if we received a ViewMsg_SelectRange from the browser and are waiting
+  // for WebKit to update the selection and call us back through
+  // didChangeSelection().
+  // This is used by didChangeSelection() to determine if the selection change
+  // has happened due to an input event or due to ViewMsg_SelectRange message
+  // from the browser.
+  bool selection_ack_pending_;
+
   // ---------------------------------------------------------------------------
   // ADDING NEW DATA? Please see if it fits appropriately in one of the above
   // sections rather than throwing it randomly at the end. If you're adding a