Add Needed Forward Declaration

content/shell/renderer/test_runner/test_plugin.h

 // 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.
 
 #ifndef CONTENT_SHELL_RENDERER_TEST_RUNNER_TEST_PLUGIN_H_
 #define CONTENT_SHELL_RENDERER_TEST_RUNNER_TEST_PLUGIN_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/texture_layer.h"
 #include "cc/layers/texture_layer_client.h"
 #include "content/public/test/layouttest_support.h"
 #include "third_party/WebKit/public/platform/WebExternalTextureLayer.h"
 #include "third_party/WebKit/public/platform/WebExternalTextureLayerClient.h"
 #include "third_party/WebKit/public/platform/WebExternalTextureMailbox.h"
 #include "third_party/WebKit/public/platform/WebLayer.h"
 #include "third_party/WebKit/public/web/WebPlugin.h"
 #include "third_party/WebKit/public/web/WebPluginContainer.h"
 
 namespace blink {
 class WebFrame;
+class WebGraphicsContext3D;
 class WebLayer;
+struct WebPluginParams;
 }
 
 namespace content {
 
 class WebTestDelegate;
 
 // A fake implemention of blink::WebPlugin for testing purposes.
 //
 // It uses WebGraphicsContext3D to paint a scene consisiting of a primitive
 // over a background. The primitive and background can be customized using
@@ skipping 131 matching lines @@
 
   bool is_persistent_;
   bool can_create_without_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(TestPlugin);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_TEST_PLUGIN_H_