media: Add External Clear Key content browser test on Android

content/shell/renderer/shell_content_renderer_client.h

 // 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.
 
 #ifndef CONTENT_SHELL_RENDERER_SHELL_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_SHELL_RENDERER_SHELL_CONTENT_RENDERER_CLIENT_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
+#include "build/build_config.h"
 #include "content/public/renderer/content_renderer_client.h"
 
 namespace web_cache {
 class WebCacheImpl;
 }
 
 namespace content {
 
 class ShellContentRendererClient : public ContentRendererClient {
  public:
   ShellContentRendererClient();
   ~ShellContentRendererClient() override;
 
   // ContentRendererClient implementation.
   void RenderThreadStarted() override;
   void RenderViewCreated(RenderView* render_view) override;
 
   // TODO(mkwst): These toggle based on the kEnablePepperTesting flag. Do we
   // need that outside of layout tests?
   bool IsPluginAllowedToUseCompositorAPI(const GURL& url) override;
   bool IsPluginAllowedToUseDevChannelAPIs() override;
 
   void DidInitializeWorkerContextOnWorkerThread(
       v8::Local<v8::Context> context) override;
 
   void ExposeInterfacesToBrowser(
       shell::InterfaceRegistry* interface_registry) override;
 
+#if defined(OS_ANDROID)
+  void AddSupportedKeySystems(
+      std::vector<std::unique_ptr<media::KeySystemProperties>>* key_systems)
+      override;
+#endif
+
  private:
   std::unique_ptr<web_cache::WebCacheImpl> web_cache_impl_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_SHELL_CONTENT_RENDERER_CLIENT_H_