Migrate GpuProcess to use MojoChild/ShellConnection for the Shell handshake

content/content.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,  # Use higher warning level.
     'chromium_enable_vtune_jit_for_v8%': 0,  # enable the vtune support for V8 engine.
   },
   'target_defaults': {
@@ skipping 73 matching lines @@
       'variables': {
         'application_type': 'exe',
         'application_name': 'content_renderer',
         'source_manifest': '<(DEPTH)/content/public/app/mojo/content_renderer_manifest.json',
       },
       'includes': [
         '../mojo/public/mojo_application_manifest.gypi',
       ],
       'hard_dependency': 1,
     },
+    {
+      # GN version: //content/public/app:gpu_manifest
+      'target_name': 'content_app_gpu_manifest',
+      'type': 'none',
+      'variables': {
+        'application_type': 'exe',
+        'application_name': 'content_gpu',
+        'source_manifest': '<(DEPTH)/content/public/app/mojo/content_gpu_manifest.json',
+      },
+      'includes': [
+        '../mojo/public/mojo_application_manifest.gypi',
+      ],
+      'hard_dependency': 1,
+    },
   ],
   'includes': [
     '../build/win_precompile.gypi',
     'content_resources.gypi',
   ],
   'conditions': [
     ['OS == "win"', {
       'targets': [
         {
           # GN: //content:sandbox_helper_win
@@ skipping 596 matching lines @@
           },
           'includes': [
             '../build/android/copy_ex.gypi',
             '../build/android/v8_external_startup_data_arch_suffix.gypi',
           ],
         },
       ],
     }],  # OS == "android"
   ],
 }