mac: Add traffic lights to fullscreen mode in Yosemite.

chrome/browser/ui/cocoa/browser_window_controller_private.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller_private.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/mac/mac_util.h"
@@ skipping 315 matching lines @@
                      fullscreen:(BOOL)fullscreen {
   // Nothing to do if no tab strip.
   if (![self hasTabStrip])
     return maxY;
 
   NSView* tabStripView = [self tabStripView];
   CGFloat tabStripHeight = NSHeight([tabStripView frame]);
   maxY -= tabStripHeight;
   [tabStripView setFrame:NSMakeRect(0, maxY, width, tabStripHeight)];
 
+  // In Yosemite fullscreen, manually add the fullscreen controls to the tab
+  // strip.
+  BOOL addControlsInFullscreen =
+      [self isInAppKitFullscreen] && base::mac::IsOSYosemiteOrLater();
+
   // Set left indentation based on fullscreen mode status.
-  [tabStripController_ setLeftIndentForControls:(fullscreen ? 0 :
-      [[tabStripController_ class] defaultLeftIndentForControls])];
+  CGFloat leftIndent = 0;
+  if (!fullscreen || addControlsInFullscreen)
+    leftIndent = [[tabStripController_ class] defaultLeftIndentForControls];
+  [tabStripController_ setLeftIndentForControls:leftIndent];
+
+  if (addControlsInFullscreen)
+    [tabStripController_ addWindowControls];
+  else
+    [tabStripController_ removeWindowControls];
 
   // Lay out the icognito/avatar badge because calculating the indentation on
   // the right depends on it.
   NSView* avatarButton = [avatarButtonController_ view];
   if ([self shouldShowAvatar]) {
     CGFloat badgeXOffset = -kAvatarRightOffset;
     CGFloat badgeYOffset = 0;
     CGFloat buttonHeight = NSHeight([avatarButton frame]);
 
     if ([self shouldUseNewAvatarButton]) {
@@ skipping 818 matching lines @@
 
 - (void)exitAppKitFullscreen {
   DCHECK(base::mac::IsOSLionOrLater());
   if (FramedBrowserWindow* framedBrowserWindow =
           base::mac::ObjCCast<FramedBrowserWindow>([self window])) {
     [framedBrowserWindow toggleSystemFullScreen];
   }
 }
 
 @end  // @implementation BrowserWindowController(Private)