Add embedder api for participating in gpu logic

content/BUILD.gn

 # Copyright 2014 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.
 
 import("//tools/grit/grit_rule.gni")
 import("//build/config/nacl/config.gni")
 
 # Applied by targets internal to content.
 config("content_implementation") {
   defines = [ "CONTENT_IMPLEMENTATION" ]
@@ skipping 25 matching lines @@
 # to avoid dependency cycles, and external dependencies must depend on the
 # //content/public/browser and similar targets to avoid double-linking (these
 # targets make sure the dependency goes through the content shared library
 # when doing a component build).
 
 if (!is_nacl_nonsfi) {
   content_shared_components = [
     "//content/gpu:gpu_sources",
     "//content/public/browser:browser_sources",
     "//content/public/child:child_sources",
+    "//content/public/gpu:gpu_sources",
     "//content/public/common:common_sources",
     "//content/public/plugin:plugin_sources",
     "//content/public/renderer:renderer_sources",
     "//content/public/utility:utility_sources",
   ]
 
   if (enable_plugins) {
     content_shared_components +=
         [ "//content/ppapi_plugin:ppapi_plugin_sources" ]
   }
@@ skipping 56 matching lines @@
     sources = [
       "app/sandbox_helper_win.cc",
       "public/app/sandbox_helper_win.h",
     ]
 
     deps = [
       "//sandbox",
     ]
   }
 }