[Notifications] Make image background white like notification background

ui/message_center/message_center_style.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.
 
 #ifndef UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_
 
 #include <stddef.h>
 
 #include "build/build_config.h"
@@ skipping 62 matching lines @@
 const int kTitleFontSize = 14;             // For title only.
 const int kEmptyCenterFontSize = 13;       // For empty message only.
 const int kTitleLineHeight = 20;           // In DIPs.
 const int kMessageFontSize = 12;           // For everything but title.
 const int kMessageLineHeight = 18;         // In DIPs.
 
 // Colors.
 // Background of the card.
 const SkColor kNotificationBackgroundColor = SK_ColorWHITE;
 // Background of the image.
-const SkColor kImageBackgroundColor = SkColorSetRGB(0x22, 0x22, 0x22);
+const SkColor kImageBackgroundColor = kNotificationBackgroundColor;
 // Title, message, ...
 const SkColor kRegularTextColor = SkColorSetRGB(0x33, 0x33, 0x33);
 const SkColor kDimTextColor = SkColorSetRGB(0x7f, 0x7f, 0x7f);
 // The focus border.
 const SkColor kFocusBorderColor = SkColorSetRGB(64, 128, 250);
 // Foreground of small icon image.
 const SkColor kSmallImageMaskForegroundColor = SK_ColorWHITE;
 // Background of small icon image.
 const SkColor kSmallImageMaskBackgroundColor = SkColorSetRGB(0xa3, 0xa3, 0xa3);
 
@@ skipping 58 matching lines @@
 
 const SkColor kMessageCenterBackgroundColor = SkColorSetRGB(0xee, 0xee, 0xee);
 // Separator color for the tray.
 const SkColor kFooterDelimiterColor = SkColorSetRGB(0xcc, 0xcc, 0xcc);
 // Text color for tray labels.
 const SkColor kFooterTextColor = SkColorSetRGB(0x7b, 0x7b, 0x7b);
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_