Add an empty message to the notification center.

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 "base/basictypes.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/size.h"
@@ skipping 11 matching lines @@
 const int kNotificationPreferredImageWidth = 360;
 const int kNotificationPreferredImageHeight = 240;
 const int kSettingsIconSize = 16;
 
 // Limits.
 const size_t kMaxVisibleMessageCenterNotifications = 100;
 const size_t kMaxVisiblePopupNotifications = 3;
 
 // DIP dimension; H size of the whole card.
 const int kNotificationWidth = 360;
+const int kMinScrollViewHeight = 100;
 
 // Colors.
 MESSAGE_CENTER_EXPORT extern const SkColor kMessageCenterBorderColor;
 MESSAGE_CENTER_EXPORT extern const SkColor kMessageCenterShadowColor;
 
 // Settings dialog constants.
 namespace settings {
 
 const SkColor kEntrySeparatorColor = SkColorSetARGB(0.1 * 255, 0, 0, 0);
 const int kEntryHeight = 45;
@@ skipping 13 matching lines @@
 // DIP dimensions (H = horizontal, V = vertical).
 
 const int kControlButtonSize = 29;  // Square size of close & expand buttons.
 const int kIconToTextPadding = 16;  // H space between icon & title/message.
 const int kTextTopPadding = 12;     // V space between text elements.
 const int kIconBottomPadding = 16;  // Minimum non-zero V space between icon
                                     // and frame.
 
 // Text sizes.
 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.
 extern const SkColor kNotificationBackgroundColor; // Background of the card.
 extern const SkColor kImageBackgroundColor;        // Background of the image.
 extern const SkColor kIconBackgroundColor;         // Used behind icons smaller
                                                    // than the icon view.
 extern const SkColor kRegularTextColor;            // Title, message, ...
@@ skipping 51 matching lines @@
 
 extern const SkColor kShadowColor;           // Shadow in the tray.
 
 extern const SkColor kMessageCenterBackgroundColor;
 extern const SkColor kFooterDelimiterColor;  // Separator color for the tray.
 extern const SkColor kFooterTextColor;       // Text color for tray labels.
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_STYLE_H_