Adds DNS prefetch support to Chromecast.

chromecast/renderer/cast_content_renderer_client.h

Index: chromecast/renderer/cast_content_renderer_client.h
diff --git a/chromecast/renderer/cast_content_renderer_client.h b/chromecast/renderer/cast_content_renderer_client.h
index e7d4654d5d04335bc71b93db05069f3d652b0415..1f61b0690438962835de1b56022ed0712a71d2ae 100644
--- a/chromecast/renderer/cast_content_renderer_client.h
+++ b/chromecast/renderer/cast_content_renderer_client.h
@@ -5,21 +5,33 @@
 #ifndef CHROMECAST_RENDERER_CAST_CONTENT_RENDERER_CLIENT_H_
 #define CHROMECAST_RENDERER_CAST_CONTENT_RENDERER_CLIENT_H_
 
+#include "base/macros.h"
 #include "content/public/renderer/content_renderer_client.h"
 
+namespace dns_prefetch {
+class PrescientNetworkingDispatcher;
+}  // namespace dns_prefetch
+
 namespace chromecast {
 namespace shell {
 
 class CastContentRendererClient : public content::ContentRendererClient {
  public:
-  CastContentRendererClient() {}
-  virtual ~CastContentRendererClient() {}
+  CastContentRendererClient();
+  ~CastContentRendererClient() override;
 
   // ContentRendererClient implementation:
-  virtual void RenderThreadStarted() override;
-  virtual void RenderViewCreated(content::RenderView* render_view) override;
-  virtual void AddKeySystems(
+  void RenderThreadStarted() override;
+  void RenderViewCreated(content::RenderView* render_view) override;
+  void AddKeySystems(
       std::vector< ::media::KeySystemInfo>* key_systems) override;
+  blink::WebPrescientNetworking* GetPrescientNetworking() override;
+
+ private:
+  scoped_ptr<dns_prefetch::PrescientNetworkingDispatcher>
+      prescient_networking_dispatcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(CastContentRendererClient);
 };
 
 }  // namespace shell