Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

components/bubble.gypi

 # Copyright 2015 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.
 
 {
   'targets': [
     {
-      # GN version: //components/about_handler
-      'target_name': 'about_handler',
+      # GN version: //components/bubble
+      'target_name': 'bubble',
       'type': 'static_library',
-      'dependencies': [
-        '../base/base.gyp:base',
-        '../net/net.gyp:net',
-      ],
       'include_dirs': [
         '..',
       ],
+      'dependencies': [
+        '../ui/gfx/gfx.gyp:gfx',
+      ],
       'sources': [
         # Note: sources list duplicated in GN build.
-        'about_handler/about_protocol_handler.cc',
-        'about_handler/about_protocol_handler.h',
-        'about_handler/url_request_about_job.cc',
-        'about_handler/url_request_about_job.h',
+        'bubble/bubble_controller.cc',
+        'bubble/bubble_controller.h',
+        'bubble/bubble_delegate.cc',
+        'bubble/bubble_delegate.h',
+        'bubble/bubble_manager.cc',
+        'bubble/bubble_manager.h',
+        'bubble/bubble_ui.h',
       ],
     },
   ],
 }