Mac: Optimize TabView drawing.

chrome/browser/ui/cocoa/tabs/tab_controller.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/tabs/tab_controller.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/i18n/rtl.h"
@@ skipping 93 matching lines @@
         NSMakeRect(127, 4, 18, 18)]);
     [closeButton_ setAutoresizingMask:NSViewMinXMargin];
     [closeButton_ setTarget:self];
     [closeButton_ setAction:@selector(closeTab:)];
 
     base::scoped_nsobject<TabView> view([[TabView alloc]
         initWithFrame:NSMakeRect(0, 0, 160, [TabController defaultTabHeight])
            controller:self
           closeButton:closeButton_]);
     [view setAutoresizingMask:NSViewMaxXMargin | NSViewMinYMargin];
+    [view setPostsFrameChangedNotifications:NO];
+    [view setPostsBoundsChangedNotifications:NO];
     [view addSubview:iconView_];
     [view addSubview:closeButton_];
     [view setTitleFrame:titleFrame];
     [super setView:view];
 
     isIconShowing_ = YES;
     NSNotificationCenter* defaultCenter = [NSNotificationCenter defaultCenter];
     [defaultCenter addObserver:self
                       selector:@selector(themeChangedNotification:)
                           name:kBrowserThemeDidChangeNotification
@@ skipping 324 matching lines @@
 // TabStripDragController.
 - (BOOL)tabCanBeDragged:(TabController*)controller {
   return [[target_ dragController] tabCanBeDragged:controller];
 }
 
 - (void)maybeStartDrag:(NSEvent*)event forTab:(TabController*)tab {
   [[target_ dragController] maybeStartDrag:event forTab:tab];
 }
 
 @end