Add line height setting to views::Label & use it for notifications.

ui/message_center/message_center_constants.cc

 // 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.
 
 #include "ui/message_center/message_center_constants.h"
 
 namespace message_center {
 
 // Exported values /////////////////////////////////////////////////////////////
 
 // Square image sizes in pixels.
 const int kNotificationButtonIconSize = 16;
 const int kNotificationIconSize = 80;
 const int kNotificationPreferredImageSize = kNotificationWidth;
 const int kSettingsIconSize = 16;
 
 // Within a notification ///////////////////////////////////////////////////////
 
 // Pixel dimensions.
 const int kControlButtonSize = 29;
 const int kNotificationWidth = 360;
 const int kIconToTextPadding = 16;
 const int kTextTopPadding = 12;
 
 // Text sizes.
 const int kTitleFontSize = 14;
 const int kMessageFontSize = 12;
+const int kMessageLineHeight = 18;
 
 // Colors.
 const SkColor kNotificationBackgroundColor = SkColorSetRGB(255, 255, 255);
 const SkColor kLegacyIconBackgroundColor = SkColorSetRGB(230, 230, 230);
 const SkColor kRegularTextColor = SkColorSetRGB(51, 51, 51);
 const SkColor kFocusBorderColor = SkColorSetRGB(64, 128, 250);
 
 // Limits.
 const int kNotificationMaximumImageHeight = kNotificationWidth;
 const size_t kNotificationMaximumItems = 8;
 
 // Timing.
 const int kAutocloseDefaultDelaySeconds = 8;
 const int kAutocloseHighPriorityDelaySeconds = 25;
 
 // Around notifications ////////////////////////////////////////////////////////
 
 // Pixel dimensions.
 const int kMarginBetweenItems = 10;
 
 // Colors.
 const SkColor kBackgroundLightColor = SkColorSetRGB(0xf1, 0xf1, 0xf1);
 const SkColor kBackgroundDarkColor = SkColorSetRGB(0xe7, 0xe7, 0xe7);
 
 }  // namespace message_center