[Mac][MC] Allow right click to open the message center tray.

ui/message_center/cocoa/status_item_view.mm

 // Copyright (c) 2013 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 "ui/message_center/cocoa/status_item_view.h"
 
 #include <cmath>
 
 #include "base/format_macros.h"
 #include "grit/ui_resources.h"
@@ skipping 37 matching lines @@
   unreadCount_ = unreadCount;
   [self setNeedsDisplay:YES];
 }
 
 - (void)setHighlight:(BOOL)highlight {
   highlight_ = highlight;
   [self setNeedsDisplay:YES];
 }
 
 - (void)mouseDown:(NSEvent*)event {
-  DCHECK(!inMouseEventSequence_);
   inMouseEventSequence_ = YES;
   [self setNeedsDisplay:YES];
 
   if (callback_)
     callback_.get()();
 }
 
 - (void)mouseUp:(NSEvent*)event {
-  DCHECK(inMouseEventSequence_);
   inMouseEventSequence_ = NO;
   [self setNeedsDisplay:YES];
 }
 
+- (void)rightMouseDown:(NSEvent*)event {
+  [self mouseDown:event];
+}
+
+- (void)rightMouseUp:(NSEvent*)event {
+  [self mouseUp:event];
+}
+
+- (void)otherMouseDown:(NSEvent*)event {
+  [self mouseDown:event];
+}
+
+- (void)otherMouseUp:(NSEvent*)event {
+  [self mouseUp:event];
+}
+
 - (void)drawRect:(NSRect)dirtyRect {
   NSRect frame = [self bounds];
 
   // Draw the background color.
   BOOL highlight = highlight_ || inMouseEventSequence_;
   [statusItem_ drawStatusBarBackgroundInRect:frame
                                withHighlight:highlight];
 
   // Draw the icon.
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
@@ skipping 31 matching lines @@
     NSPoint countPoint = NSMakePoint(
         floorf(NSMinX(textSlice) + (NSWidth(textSlice) - stringSize.width) / 2),
         floorf(NSMinY(textSlice) +
                (NSHeight(textSlice) - stringSize.height) / 2));
 
     [count drawAtPoint:countPoint withAttributes:attributes];
   }
 }
 
 @end