mac: Add overscroll animator slider

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 10.6).
 // 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).
 
@@ skipping 95 matching lines @@
 - (void)setRestorable:(BOOL)flag;
 @end
 
 @interface NSCursor (LionSDKDeclarations)
 + (NSCursor*)IBeamCursorForVerticalLayout;
 @end
 
 @interface NSAnimationContext (LionSDK)
 + (void)runAnimationGroup:(void (^)(NSAnimationContext *context))changes
         completionHandler:(void (^)(void))completionHandler;
+@property(copy) void(^completionHandler)(void);
 @end
 
 @interface NSView (LionSDK)
 - (NSSize)convertSizeFromBacking:(NSSize)size;
 - (void)setWantsBestResolutionOpenGLSurface:(BOOL)flag;
 @end
 
 @interface NSObject (ICCameraDeviceDelegateLionSDK)
 - (void)deviceDidBecomeReadyWithCompleteContentCatalog:(ICDevice*)device;
 - (void)didDownloadFile:(ICCameraFile*)file
@@ skipping 127 matching lines @@
 
 @interface NSWindow (YosemiteSDK)
 
 @property NSWindowTitleVisibility titleVisibility;
 
 @end
 
 #endif  // MAC_OS_X_VERSION_10_10
 
 #endif  // BASE_MAC_SDK_FORWARD_DECLARATIONS_H_