Preliminary fullscreen mode support....

chrome/browser/browser.h

Index: chrome/browser/browser.h
===================================================================
--- chrome/browser/browser.h	(revision 9882)
+++ chrome/browser/browser.h	(working copy)
@@ -245,6 +245,7 @@
   void DuplicateTab();
   void RestoreTab();
   void ConvertPopupToTabbedBrowser();
+  void ToggleFullscreenMode();
   void Exit();
 
   // Page-related commands
@@ -412,10 +413,13 @@
   // Initialize state for all browser commands.
   void InitCommandState();
 
-  // Update commands which may be enabled or disabled depending on the tab's
-  // state.
+  // Update commands whose state depends on the tab's state.
   void UpdateCommandsForTabState();
 
+  // Update commands whose state depends on whether the window is in fullscreen
+  // mode.
+  void UpdateCommandsForFullscreenMode(bool is_fullscreen);
+
   // Set the correct stop/go icon and update the Go and Stop command states.
   // |is_loading| is true if the current TabContents is loading.
   void UpdateStopGoState(bool is_loading);