Implement a basic PPAPI plugin for Blink layout tests.

content/shell/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/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/manifest.gni")
 import("//tools/grit/repack.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 197 matching lines @@
     "//content/gpu",
     "//content/test:layouttest_support",
     "//device/bluetooth",
     "//device/bluetooth:mocks",
     "//gin",
     "//gpu",
     "//ipc",
     "//media",
     "//net",
     "//net:net_resources",
+    "//ppapi:blink_test_plugin",
     "//skia",
     "//storage/browser",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/public:blink",
     "//third_party/WebKit/public:image_resources",
     "//third_party/WebKit/public:resources",
     "//third_party/WebKit/public:test_support",
     "//third_party/icu",
     "//ui/base",
@@ skipping 254 matching lines @@
     sources = [
       "app/shell_content_main.cc",
       "app/shell_content_main.h",
     ]
 
     deps = [
       ":content_shell_lib",
     ]
   }
 }