Implement touch selection for RWHVV.

content/browser/renderer_host/render_widget_host_view.h

Index: content/browser/renderer_host/render_widget_host_view.h
diff --git a/content/browser/renderer_host/render_widget_host_view.h b/content/browser/renderer_host/render_widget_host_view.h
index 8463cb8777a813eb340f75b2249b9efdc411b352..cd1bc2f95490d91957d9c4ea293cdda165ef0be7 100644
--- a/content/browser/renderer_host/render_widget_host_view.h
+++ b/content/browser/renderer_host/render_widget_host_view.h
@@ -179,9 +179,13 @@ class RenderWidgetHostView {
   // the page has changed.
   virtual void SetTooltipText(const std::wstring& tooltip_text) = 0;
 
-  // Notifies the View that the renderer text selection has changed.
+  // Notifies the View that the renderer text selection has changed. |start|
+  // and |end| are the visual end points of the selection in the coordinate
+  // system of the render view.
   virtual void SelectionChanged(const std::string& text,
-                                const ui::Range& range) {}
+                                const ui::Range& range,
+                                const gfx::Point& start,
+                                const gfx::Point& end) {}
 
   // Tells the View whether the context menu is showing. This is used on Linux
   // to suppress updates to webkit focus for the duration of the show.