Adds the contextMessage field to notifications.

ui/message_center/cocoa/notification_controller_unittest.mm

 // Copyright (c) 2013 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/notification_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 66 matching lines @@
 }
 
 - (NSTextField*)titleView {
   return title_.get();
 }
 
 - (NSTextField*)messageView {
   return message_.get();
 }
 
+- (NSTextField*)contextMessageView {
+  return contextMessage_.get();
+}
+
 - (NSView*)listItemView {
   return listItemView_.get();
 }
 @end
 
 class NotificationControllerTest : public ui::CocoaTest {
  public:
   NSImage* TestIcon() {
     return [NSImage imageNamed:NSImageNameUser];
   }
@@ skipping 168 matching lines @@
 
 TEST_F(NotificationControllerTest, List) {
   message_center::RichNotificationData optional;
   message_center::NotificationItem item1(
       UTF8ToUTF16("First title"), UTF8ToUTF16("first message"));
   optional.items.push_back(item1);
   message_center::NotificationItem item2(
       UTF8ToUTF16("Second title"),
       UTF8ToUTF16("second slightly longer message"));
   optional.items.push_back(item2);
+  optional.context_message = UTF8ToUTF16("Context Message");
 
   scoped_ptr<message_center::Notification> notification(
       new message_center::Notification(
           message_center::NOTIFICATION_TYPE_BASE_FORMAT,
           "an_id",
           UTF8ToUTF16("Notification Title"),
           UTF8ToUTF16("Notification Message - should be hidden"),
           gfx::Image(),
           string16(),
           message_center::NotifierId(),
           optional,
           NULL));
 
   MockMessageCenter message_center;
   base::scoped_nsobject<MCNotificationController> controller(
       [[MCNotificationController alloc] initWithNotification:notification.get()
                                                messageCenter:&message_center]);
   [controller view];
 
   EXPECT_FALSE([[controller titleView] isHidden]);
   EXPECT_TRUE([[controller messageView] isHidden]);
+  EXPECT_FALSE([[controller contextMessageView] isHidden]);
 
   EXPECT_EQ(2u, [[[controller listItemView] subviews] count]);
   EXPECT_LT(NSMaxY([[controller listItemView] frame]),
             NSMinY([[controller titleView] frame]));
 }