Move PlatformContext3DImpl to separate file

chrome/chrome_renderer.gypi

 # Copyright (c) 2010 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': [
     {
       'target_name': 'renderer',
       'type': '<(library)',
       'msvs_guid': '9301A569-5D2B-4D11-9332-B1E30AEACB8D',
@@ skipping 124 matching lines @@
         'renderer/paint_aggregator.cc',
         'renderer/page_click_listener.h',
         'renderer/page_click_tracker.cc',
         'renderer/page_click_tracker.h',
         'renderer/page_load_histograms.cc',
         'renderer/page_load_histograms.h',
         'renderer/password_autocomplete_manager.cc',
         'renderer/password_autocomplete_manager.h',
         'renderer/pepper_devices.cc',
         'renderer/pepper_devices.h',
+        'renderer/pepper_platform_context_3d_impl.cc',
+        'renderer/pepper_platform_context_3d_impl.h',
         'renderer/pepper_plugin_delegate_impl.cc',
         'renderer/pepper_plugin_delegate_impl.h',
         'renderer/pepper_scrollbar_widget.cc',
         'renderer/pepper_scrollbar_widget.h',
         'renderer/pepper_widget.cc',
         'renderer/pepper_widget.h',
         'renderer/plugin_channel_host.cc',
         'renderer/plugin_channel_host.h',
         'renderer/print_web_view_helper.cc',
         'renderer/print_web_view_helper.h',
@@ skipping 216 matching lines @@
       ],
     },
   ],
 }
 
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