MacViews: Implement Force Touch/Mac dictionary lookup for Textfields.

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).
 
@@ skipping 99 matching lines @@
 
 @interface NSControl (MountainLionSDK)
 @property BOOL allowsExpansionToolTips;
 @end
 
 @interface NSNib (MountainLionSDK)
 - (BOOL)instantiateWithOwner:(id)owner
              topLevelObjects:(NSArray**)topLevelObjects;
 @end
 
+@interface NSMutableDictionary (MountainLionSDK)
+- (void)setObject:(id)obj forKeyedSubscript:(id<NSCopying>)key;
+@end
+
 #endif  // MAC_OS_X_VERSION_10_8
 
 // Once Chrome no longer supports OSX 10.8, everything within this preprocessor
 // block can be removed.
 #if !defined(MAC_OS_X_VERSION_10_9) || \
     MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_9
 
 // NSProgress is public API in 10.9, but a version of it exists and is usable
 // in 10.8.
 @class NSProgress;
@@ skipping 123 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_