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

base/mac/sdk_forward_declarations.h

 // 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.
 
 // This file contains forward declarations for items in later SDKs than the
 // default one with which Chromium is built (currently 10.10).
 // If you call any function from this header, be sure to check at runtime for
 // respondsToSelector: before calling these functions (else your code will crash
 // on older OS X versions that chrome still supports).
 
 #ifndef BASE_MAC_SDK_FORWARD_DECLARATIONS_H_
 #define BASE_MAC_SDK_FORWARD_DECLARATIONS_H_
 
 #import <AppKit/AppKit.h>
 #import <CoreBluetooth/CoreBluetooth.h>
 #import <CoreWLAN/CoreWLAN.h>
 #import <ImageCaptureCore/ImageCaptureCore.h>
 #import <IOBluetooth/IOBluetooth.h>
 #include <stdint.h>
 
 #include "base/base_export.h"
 
 // ----------------------------------------------------------------------------
 // Define typedefs, enums, and protocols not available in the version of the
 // OSX SDK being compiled against.
 // ----------------------------------------------------------------------------
 
+#if !defined(MAC_OS_X_VERSION_10_12) || \
+    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_12
+
+// The protocol was formalized by the 10.12 SDK, but it was informally used
+// before.
+@protocol CAAnimationDelegate
+- (void)animationDidStart:(CAAnimation*)animation;
+- (void)animationDidStop:(CAAnimation*)animation finished:(BOOL)finished;
+@end
+
+@protocol CALayerDelegate
+@end
+
+#endif  // MAC_OS_X_VERSION_10_12
+
 #if !defined(MAC_OS_X_VERSION_10_11) || \
     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_11
 
 enum {
   NSPressureBehaviorUnknown = -1,
   NSPressureBehaviorPrimaryDefault = 0,
   NSPressureBehaviorPrimaryClick = 1,
   NSPressureBehaviorPrimaryGeneric = 2,
   NSPressureBehaviorPrimaryAccelerator = 3,
   NSPressureBehaviorPrimaryDeepClick = 5,
   NSPressureBehaviorPrimaryDeepDrag = 6
 };
 typedef NSInteger NSPressureBehavior;
 
 @interface NSPressureConfiguration : NSObject
 - (instancetype)initWithPressureBehavior:(NSPressureBehavior)pressureBehavior;
 @end
 
 enum {
   NSSpringLoadingHighlightNone = 0,
   NSSpringLoadingHighlightStandard,
   NSSpringLoadingHighlightEmphasized
 };
 typedef NSUInteger NSSpringLoadingHighlight;
 
-#endif // MAC_OS_X_VERSION_10_11
+#endif  // MAC_OS_X_VERSION_10_11
 
 // ----------------------------------------------------------------------------
 // Define NSStrings only available in newer versions of the OSX SDK to force
 // them to be statically linked.
 // ----------------------------------------------------------------------------
 
 extern "C" {
 #if !defined(MAC_OS_X_VERSION_10_9) || \
     MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_9
 BASE_EXPORT extern NSString* const NSWindowDidChangeOcclusionStateNotification;
@@ skipping 163 matching lines @@
 
 // ----------------------------------------------------------------------------
 // The symbol for kCWSSIDDidChangeNotification is available in the
 // CoreWLAN.framework for OSX versions 10.6 through 10.10. The symbol is not
 // declared in the OSX 10.9+ SDK, so when compiling against an OSX 10.9+ SDK,
 // declare the symbol.
 // ----------------------------------------------------------------------------
 BASE_EXPORT extern "C" NSString* const kCWSSIDDidChangeNotification;
 
 #endif  // BASE_MAC_SDK_FORWARD_DECLARATIONS_H_