[Extensions Toolbar Mac] Make new toolbar actions slide out from the right

chrome/browser/ui/cocoa/extensions/browser_actions_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/extensions/browser_actions_controller.h"
 
 #include <cmath>
 #include <string>
 
 #include "base/strings/sys_string_conversions.h"
@@ skipping 401 matching lines @@
     [item setTarget:self];
     [item setEnabled:[button isEnabled]];
   }
 }
 
 #pragma mark -
 #pragma mark Private Methods
 
 - (void)addViewForAction:(ToolbarActionViewController*)action
                withIndex:(NSUInteger)index {
-  NSRect buttonFrame = NSMakeRect(0.0,
+  NSRect buttonFrame = NSMakeRect(NSMaxX([containerView_ bounds]),
                                   kBrowserActionOriginYOffset,
                                   ToolbarActionsBar::IconWidth(false),
                                   ToolbarActionsBar::IconHeight());
   BrowserActionButton* newButton =
       [[[BrowserActionButton alloc]
          initWithFrame:buttonFrame
         viewController:action
             controller:self] autorelease];
   [newButton setTarget:self];
   [newButton setAction:@selector(browserActionClicked:)];
@@ skipping 326 matching lines @@
 
 - (BrowserActionButton*)buttonWithIndex:(NSUInteger)index {
   const std::vector<ToolbarActionViewController*>& toolbar_actions =
       toolbarActionsBar_->toolbar_actions();
   if (index < toolbar_actions.size())
     return [self buttonForId:toolbar_actions[index]->GetId()];
   return nil;
 }
 
 @end