Fix the remaining subpixel antialiasing bugs in the notification center.

ui/message_center/cocoa/opaque_views.h

+// Copyright (c) 2014 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.
+
+#ifndef UI_MESSAGE_CENTER_COCOA_OPAQUE_VIEWS_H_
+#define UI_MESSAGE_CENTER_COCOA_OPAQUE_VIEWS_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/mac/scoped_nsobject.h"
+
+// MCDropDown is the same as an NSPopupButton except that it fills its
+// background with a settable color.
+@interface MCDropDown : NSPopUpButton {
+ @private
+  base::scoped_nsobject<NSColor> backgroundColor_;
+}
+
+// Gets and sets the bubble's background color.
+- (NSColor*)backgroundColor;
+- (void)setBackgroundColor:(NSColor*)backgroundColor;
+@end
+
+// MCTextField fills its background with an opaque color.  It also configures
+// the view to have a plan appearance, without bezel, border, editing, etc.
+@interface MCTextField : NSTextField {
+ @private
+  base::scoped_nsobject<NSColor> backgroundColor_;
+}
+
+// Use this method to create the text field.  The color is required so it
+// can correctly subpixel antialias.
+- (id)initWithFrame:(NSRect)frameRect backgroundColor:(NSColor*)color;
+@end
+
+#endif  // UI_MESSAGE_CENTER_COCOA_OPAQUE_VIEWS_H_