Reintroduce OffscreenCanvasSurfaceClient interface.

content/test/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("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 1478 matching lines @@
     "//services/service_manager/public/cpp:service_test_support",
     "//skia",
     "//sql",
     "//sql:test_support",
     "//storage/browser",
     "//storage/browser:test_support",
     "//storage/common",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/public:blink",
+    "//third_party/WebKit/public:offscreen_canvas_mojo_bindings",
     "//third_party/icu",
     "//third_party/leveldatabase",
     "//third_party/re2",
     "//third_party/webrtc_overrides",
     "//third_party/widevine/cdm:headers",
     "//ui/accessibility",
     "//ui/base:test_support",
     "//ui/compositor:test_support",
     "//ui/display",
     "//ui/display:test_support",
@@ skipping 310 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }