Add a help bubble pointing to the omnibox when installing an extension with

chrome/browser/ui/views/location_bar/location_bar_view.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_VIEW_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 130 matching lines @@
 
   // Retrieves the PageAction View which is associated with |page_action|.
   views::View* GetPageActionView(ExtensionAction* page_action);
 
   // Toggles the star on or off.
   void SetStarToggled(bool on);
 
   // Shows the bookmark bubble.
   void ShowStarBubble(const GURL& url, bool newly_bookmarked);
 
+  // Returns the screen coordinates of the location entry (where the URL text
+  // appears, not where the icons are shown).
+  gfx::Point GetLocationEntryOrigin() const;
+
   // Sizing functions
   virtual gfx::Size GetPreferredSize();
 
   // Layout and Painting functions
   virtual void Layout();
   virtual void Paint(gfx::Canvas* canvas);
 
   // No focus border for the location bar, the caret is enough.
   virtual void PaintFocusBorder(gfx::Canvas* canvas) { }
 
@@ skipping 234 matching lines @@
   // Should instant be updated? This is set to false in OnAutocompleteWillAccept
   // and true in OnAutocompleteAccept. This is needed as prior to accepting an
   // autocomplete suggestion the model is reverted which triggers resetting
   // instant.
   bool update_instant_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(LocationBarView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_VIEW_H_