media_controls: Add UI for showing a promo bubble on a control button.

third_party/WebKit/public/platform/WebLocalizedString.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 82 matching lines @@
     kAXWeekOfYearFieldText,
     kAXYearFieldText,
     kBlockedPluginText,
     kCalendarClear,
     kCalendarToday,
     kDateFormatDayInMonthLabel,
     kDateFormatMonthLabel,
     kDateFormatYearLabel,
     kDetailsLabel,
     kDownloadButtonLabel,
+    kDownloadButtonPromoText,
     kFileButtonChooseFileLabel,
     kFileButtonChooseMultipleFilesLabel,
     kFileButtonNoFileSelectedLabel,
     kInputElementAltText,
     kMediaRemotingDisableText,
     kMediaRemotingCastText,
     kMissingPluginText,
     kMultipleFileUploadText,
     kOtherColorLabel,
     kOtherDateLabel,
@@ skipping 63 matching lines @@
     kValidationValueMissingForRadio,
     kValidationValueMissingForSelect,
     kWeekFormatTemplate,
     kWeekNumberLabel,
   };
 };
 
 }  // namespace blink
 
 #endif