Add a ExtensionBrowserTest base class

chrome/browser/views/frame/browser_view.h

Index: chrome/browser/views/frame/browser_view.h
diff --git a/chrome/browser/views/frame/browser_view.h b/chrome/browser/views/frame/browser_view.h
index fd321ce57dffb1b975eef8ca12491d8cd4453369..3af778fe03e3a2046de57f83f26a51d370916db6 100644
--- a/chrome/browser/views/frame/browser_view.h
+++ b/chrome/browser/views/frame/browser_view.h
@@ -122,6 +122,9 @@ class BrowserView : public BrowserWindow,
   // Accessor for the TabStrip.
   TabStrip* tabstrip() const { return tabstrip_; }
 
+  // Accessor for the ExtensionShelf.
+  ExtensionShelf* extension_shelf() const { return extension_shelf_; }
+
   // Returns true if various window components are visible.
   bool IsToolbarVisible() const;
   bool IsTabStripVisible() const;