Fix the remaining subpixel antialiasing bugs in the notification center.

ui/message_center/cocoa/opaque_views.mm

+// 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.
+
+#import "ui/message_center/cocoa/opaque_views.h"
+
+@implementation MCDropDown
+// The view must be opaque to render subpixel antialiasing.
+- (BOOL)isOpaque {
+  return YES;
+}
+
+// The view must also fill its background to render subpixel antialiasing.
+- (void)drawRect:(NSRect)dirtyRect {
+  [backgroundColor_ set];
+  NSRectFill(dirtyRect);
+  [super drawRect:dirtyRect];
+}
+
+- (NSColor*)backgroundColor {
+  return backgroundColor_;
+}
+
+- (void)setBackgroundColor:(NSColor*)backgroundColor {
+  backgroundColor_.reset([backgroundColor retain]);
+}
+@end
+
+@implementation MCTextField
+- (id)initWithFrame:(NSRect)frameRect backgroundColor:(NSColor*)color {
+  self = [self initWithFrame:frameRect];
+  if (self) {
+    [self setBackgroundColor:color];
+    backgroundColor_.reset([color retain]);
+  }
+  return self;
+}
+
+- (id)initWithFrame:(NSRect)frameRect {
+  self = [super initWithFrame:frameRect];
+  if (self) {
+    [self setAutoresizingMask:NSViewMinYMargin];
+    [self setBezeled:NO];
+    [self setBordered:NO];
+    [self setEditable:NO];
+    [self setSelectable:NO];
+    [self setDrawsBackground:YES];
+  }
+  return self;
+}
+
+// The view must be opaque to render subpixel antialiasing.
+- (BOOL)isOpaque {
+  return YES;
+}
+
+// The view must also fill its background to render subpixel antialiasing.
+- (void)drawRect:(NSRect)dirtyRect {
+  [backgroundColor_ set];
+  NSRectFill(dirtyRect);
+  [super drawRect:dirtyRect];
+}
+@end