MacViews: Support continuous scrolling and horizontal scrolling

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 52 matching lines @@
   NSWindowDocumentVersionsButton = 6,
   NSWindowFullScreenButton,
 };
 typedef NSUInteger NSWindowButton;
 
 @interface NSEvent (LionSDK)
 + (BOOL)isSwipeTrackingFromScrollEventsEnabled;
 
 - (NSEventPhase)momentumPhase;
 - (NSEventPhase)phase;
+- (BOOL)hasPreciseScrollingDeltas;
 - (CGFloat)scrollingDeltaX;
 - (CGFloat)scrollingDeltaY;
 - (void)trackSwipeEventWithOptions:(NSEventSwipeTrackingOptions)options
           dampenAmountThresholdMin:(CGFloat)minDampenThreshold
                                max:(CGFloat)maxDampenThreshold
                       usingHandler:(void (^)(CGFloat gestureAmount,
                                              NSEventPhase phase,
                                              BOOL isComplete,
                                              BOOL *stop))trackingHandler;
 
@@ skipping 183 matching lines @@
 @property (readonly, copy) NSString* activityType;
 @property (copy) NSURL* webPageURL;
 
 @end
 
 BASE_EXPORT extern "C" NSString* const NSUserActivityTypeBrowsingWeb;
 
 #endif  // MAC_OS_X_VERSION_10_10
 
 #endif  // BASE_MAC_SDK_FORWARD_DECLARATIONS_H_