MacViews: Get views based toolbar to compile on the Mac.

chrome/browser/ui/cocoa/toolbar/toolbar_button.mm

-// Copyright (c) 2011 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/toolbar/toolbar_button.h"
-
-@implementation ToolbarButton
-
-@synthesize handleMiddleClick = handleMiddleClick_;
-
-- (void)otherMouseDown:(NSEvent*)theEvent {
-  if (![self shouldHandleEvent:theEvent]) {
-    [super otherMouseDown:theEvent];
-    return;
-  }
-
-  NSEvent* nextEvent = theEvent;
-  BOOL isInside;
-
-  // Loop until middle button is released. Also, the mouse cursor is outside of
-  // the button, the button should not be highlighted.
-  do {
-    NSPoint mouseLoc = [self convertPoint:[nextEvent locationInWindow]
-                                 fromView:nil];
-    isInside = [self mouse:mouseLoc inRect:[self bounds]];
-    [self highlight:isInside];
-    [self setState:isInside ? NSOnState : NSOffState];
-
-    NSUInteger mask = NSOtherMouseDraggedMask | NSOtherMouseUpMask;
-    nextEvent = [[self window] nextEventMatchingMask:mask];
-  } while (!([nextEvent buttonNumber] == 2 &&
-             [nextEvent type] == NSOtherMouseUp));
-
-  // Discard the events before the middle button up event.
-  // If we don't discard it, the events will be re-processed later.
-  [[self window] discardEventsMatchingMask:NSAnyEventMask
-                               beforeEvent:nextEvent];
-
-  [self highlight:NO];
-  [self setState:NSOffState];
-  if (isInside)
-    [self sendAction:[self action] to:[self target]];
-}
-
-- (BOOL)shouldHandleEvent:(NSEvent*)theEvent {
-  // |buttonNumber| is the mouse button whose action triggered theEvent.
-  // 2 corresponds to the middle mouse button.
-  return handleMiddleClick_ && [theEvent buttonNumber] == 2;
-}
-
-@end