cc: Make OutputSurface::SwapBuffers pure virtual

mojo/mojo.gyp

 # Copyright 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.
 
 {
   'target_defaults': {
     'conditions': [
       ['mojo_shell_debug_url != ""', {
         'defines': [
           'MOJO_SHELL_DEBUG=1',
@@ skipping 14 matching lines @@
       'target_name': 'mojo',
       'type': 'none',
       'dependencies': [
         'edk/mojo_edk.gyp:mojo_edk',
         'mojo_application_manager',
         'mojo_application_manager_unittests',
         'mojo_apps_js_unittests',
         'mojo_base.gyp:mojo_base',
         'mojo_clipboard',
         'mojo_clipboard_unittests',
-        'mojo_compositor_app',
         'mojo_content_handler_demo',
         'mojo_echo_client',
         'mojo_echo_service',
         'mojo_example_apptests',
         'mojo_example_service',
         'mojo_geometry_lib',
         'mojo_html_viewer',
         'mojo_input_events_lib',
         'mojo_js_content_handler',
         'mojo_js_standalone',
@@ skipping 320 matching lines @@
       ],
       'includes': [
         'mojo_public_gles2_for_loadable_module.gypi',
       ],
       'export_dependent_settings': [
         'services/public/mojo_services_public.gyp:mojo_surfaces_bindings',
       ],
       'sources': [
         'cc/context_provider_mojo.cc',
         'cc/context_provider_mojo.h',
+        'cc/direct_output_surface.cc',
+        'cc/direct_output_surface.h',
         'cc/output_surface_mojo.cc',
         'cc/output_surface_mojo.h',
       ],
     },
     {
       # GN version: //mojo/gles2
       'target_name': 'mojo_gles2_impl',
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
@@ skipping 384 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'mojo_js_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }