Expose the selection root bounds in WebView.

public/web/WebWidget.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 176 matching lines @@
     // returns false on failure.
     virtual bool compositionRange(size_t* location, size_t* length) { return false; }
 
     // Returns information about the current text input of this WebWidget.
     virtual WebTextInputInfo textInputInfo() { return WebTextInputInfo(); }
 
     // Returns the anchor and focus bounds of the current selection.
     // If the selection range is empty, it returns the caret bounds.
     virtual bool selectionBounds(WebRect& anchor, WebRect& focus) const { return false; }
 
+    // Compute the bounds of the root element of the current selection and fills
+    // the out-parameter on success. |bounds| coordinates will be relative to the
+    // contents window and will take into account the current scale level.
+    // Returns false if there is no selection.
+    virtual bool selectionRootBounds(WebRect& bounds) const { return false; }

[jamesr, 2014/03/06 21:55:07]

why add this to WebWidget if you are only implementing it in WebViewImpl?  If
this is not relevant for other WebWidget implementations, then put it on WebView
(or possibly WebFrame or whatever makes sense).

[mlamouri (slow - plz ping), 2014/03/07 13:50:29]

This is being used in RenderWidget and it is interacting with a WebWidget, not a
WebView. I followed the same design as WebWidget::selectionBounds(), which is
declared in WebWidget but only implemented in WebView.

+
     // Called to notify that IME candidate window has changed its visibility or
     // its appearance. These calls correspond to trigger
     // candidatewindow{show,update,hide} events defined in W3C IME API.
     virtual void didShowCandidateWindow() { }
     virtual void didUpdateCandidateWindow() { }
     virtual void didHideCandidateWindow() { }
 
     // Returns the text direction at the start and end bounds of the current selection.
     // If the selection range is empty, it returns false.
     virtual bool selectionTextDirection(WebTextDirection& start, WebTextDirection& end) const { return false; }
@@ skipping 44 matching lines @@
     // content.
     virtual WebColor backgroundColor() const { return 0xFFFFFFFF; /* SK_ColorWHITE */ }
 
 protected:
     ~WebWidget() { }
 };
 
 } // namespace blink
 
 #endif