Allow dynamic switching in and out of sidetabs mode.

chrome/browser/views/tabs/side_tab.h

Index: chrome/browser/views/tabs/side_tab.h
===================================================================
--- chrome/browser/views/tabs/side_tab.h	(revision 41630)
+++ chrome/browser/views/tabs/side_tab.h	(working copy)
@@ -26,9 +26,13 @@
 
   // Closes the tab.
   virtual void CloseTab(SideTab* tab) = 0;
+
+  // Shows a context menu for the tab at the specified point in screen coords.
+  virtual void ShowContextMenu(SideTab* tab, const gfx::Point& p) = 0;
 };
 
 class SideTab : public views::View,
+                public views::ContextMenuController,
                 public views::ButtonListener,
                 public AnimationDelegate {
  public:
@@ -48,6 +52,11 @@
   // views::ButtonListener implementation:
   virtual void ButtonPressed(views::Button* sender, const views::Event& event);
 
+  // views::ContextMenuController implementation:
+  virtual void ShowContextMenu(views::View* source,
+                               const gfx::Point& p,
+                               bool is_mouse_gesture);
+
   // views::View Overrides:
   virtual void Layout();
   virtual void Paint(gfx::Canvas* canvas);