Fix OSX 10.12 compilation errors in chrome/browser/ui.

chrome/browser/ui/cocoa/tabs/tab_strip_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_strip_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 275 matching lines @@
 
 @end
 
 #pragma mark -
 
 // A delegate, owned by the CAAnimation system, that is alerted when the
 // animation to close a tab is completed. Calls back to the given tab strip
 // to let it know that |controller_| is ready to be removed from the model.
 // Since we only maintain weak references, the tab strip must call -invalidate:
 // to prevent the use of dangling pointers.
-@interface TabCloseAnimationDelegate : NSObject {
+@interface TabCloseAnimationDelegate : NSObject <CAAnimationDelegate> {
  @private
   TabStripController* strip_;  // weak; owns us indirectly
   TabController* controller_;  // weak
 }
 
 // Will tell |strip| when the animation for |controller|'s view has completed.
 // These should not be nil, and will not be retained.
 - (id)initWithTabStrip:(TabStripController*)strip
          tabController:(TabController*)controller;
 
 // Invalidates this object so that no further calls will be made to
 // |strip_|.  This should be called when |strip_| is released, to
 // prevent attempts to call into the released object.
 - (void)invalidate;
 
-// CAAnimation delegate method
+// CAAnimation delegate methods
+- (void)animationDidStart:(CAAnimation*)animation;
 - (void)animationDidStop:(CAAnimation*)animation finished:(BOOL)finished;
 
 @end
 
 @implementation TabCloseAnimationDelegate
 
 - (id)initWithTabStrip:(TabStripController*)strip
          tabController:(TabController*)controller {
   if ((self = [super init])) {
     DCHECK(strip && controller);
     strip_ = strip;
     controller_ = controller;
   }
   return self;
 }
 
 - (void)invalidate {
   strip_ = nil;
   controller_ = nil;
 }
 
+- (void)animationDidStart:(CAAnimation*)theAnimation {
+  // CAAnimationDelegate method added on OSX 10.12.
+}
 - (void)animationDidStop:(CAAnimation*)animation finished:(BOOL)finished {
   [strip_ animationDidStop:animation
              forController:controller_
                   finished:finished];
 }
 
 @end
 
 #pragma mark -
 
@@ skipping 1055 matching lines @@
 
   // Once we're totally done with the tab, delete its controller
   [tabArray_ removeObjectAtIndex:index];
 }
 
 // Called by the CAAnimation delegate when the tab completes the closing
 // animation.
 - (void)animationDidStop:(CAAnimation*)animation
            forController:(TabController*)controller
                 finished:(BOOL)finished{
-  [[animation delegate] invalidate];
+  [(TabCloseAnimationDelegate *)[animation delegate] invalidate];
   [closingControllers_ removeObject:controller];
   [self removeTab:controller];
 }
 
 // Save off which TabController is closing and tell its view's animator
 // where to move the tab to. Registers a delegate to call back when the
 // animation is complete in order to remove the tab from the model.
 - (void)startClosingTabWithAnimation:(TabController*)closingTab {
   DCHECK([NSThread isMainThread]);
 
@@ skipping 891 matching lines @@
   for (int i = 0; i < tabStripModel_->count(); i++) {
     [self updateIconsForContents:tabStripModel_->GetWebContentsAt(i) atIndex:i];
   }
 }
 
 - (void)setVisualEffectsDisabledForFullscreen:(BOOL)fullscreen {
   [tabStripView_ setVisualEffectsDisabledForFullscreen:fullscreen];
 }
 
 @end