Implement Tab Detaching in Fullscreen Mode on Mac OSX

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index 64adb652fc7812a436cdc08055a387bb71ab9a8c..87aa090af6ebf5f0e0ab370d8601708f1af926c7 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -124,6 +124,28 @@ void RecordFullscreenStyle(FullscreenStyle style) {
           delegate:self]);
 }
 
+- (void)updateFullscreenCollectionBehavior {
+  // Set the window to participate in Lion Fullscreen mode.  Setting this flag
+  // has no effect on Snow Leopard or earlier.  Panels can share a fullscreen
+  // space with a tabbed window, but they can not be primary fullscreen
+  // windows.
+  // This ensures the fullscreen button is appropriately positioned. It must
+  // be done before calling layoutSubviews because the new avatar button's
+  // position depends on the fullscreen button's position, as well as
+  // TabStripController's rightIndentForControls.
+  // The fullscreen button's position may depend on the old avatar button's
+  // width, but that does not require calling layoutSubviews first.
+  NSWindow* window = [self window];
+  NSUInteger collectionBehavior = [window collectionBehavior];
+  collectionBehavior &= ~NSWindowCollectionBehaviorFullScreenAuxiliary;
+  collectionBehavior &= ~NSWindowCollectionBehaviorFullScreenPrimary;
+  collectionBehavior |= browser_->type() == Browser::TYPE_TABBED ||
+                                browser_->type() == Browser::TYPE_POPUP
+                            ? NSWindowCollectionBehaviorFullScreenPrimary
+                            : NSWindowCollectionBehaviorFullScreenAuxiliary;
+  [window setCollectionBehavior:collectionBehavior];
+}
+
 - (void)saveWindowPositionIfNeeded {
   if (!chrome::ShouldSaveWindowPlacement(browser_.get()))
     return;