Experiment with dislodging the Extension Shelf and having it only appear on t...

chrome/browser/browser_window.h

Index: chrome/browser/browser_window.h
===================================================================
--- chrome/browser/browser_window.h	(revision 24842)
+++ chrome/browser/browser_window.h	(working copy)
@@ -75,6 +75,9 @@
   //             BrowserView.
   virtual void SelectedTabToolbarSizeChanged(bool is_animating) = 0;
 
+  // Notification for the Extension Shelf changing its size.
+  virtual void SelectedTabExtensionShelfSizeChanged() = 0;
+
   // Inform the frame that the selected tab favicon or title has changed. Some
   // frames may need to refresh their title bar.
   virtual void UpdateTitleBar() = 0;
@@ -147,6 +150,9 @@
   // Shows or hides the bookmark bar depending on its current visibility.
   virtual void ToggleBookmarkBar() = 0;
 
+  // Shows or hides the extension shelf depending on its current visibility.
+  virtual void ToggleExtensionShelf() = 0;
+
   // Shows the About Chrome dialog box.
   virtual void ShowAboutChromeDialog() = 0;