Adds DNS prefetch support to Chromecast.

chromecast/renderer/cast_content_renderer_client.cc

 // 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.
 
 #include "chromecast/renderer/cast_content_renderer_client.h"
 
 #include <sys/sysinfo.h>
 
 #include "base/command_line.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "chromecast/renderer/key_systems_cast.h"
+#include "components/dns_prefetch/renderer/prescient_networking_dispatcher.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/renderer/render_view.h"
 #include "crypto/nss_util.h"
 #include "third_party/WebKit/public/platform/WebColor.h"
 #include "third_party/WebKit/public/web/WebSettings.h"
 #include "third_party/WebKit/public/web/WebView.h"
 
 namespace chromecast {
 namespace shell {
 
 namespace {
 
 // Default background color to set for WebViews. WebColor is in ARGB format
 // though the comment of WebColor says it is in RGBA.
 const blink::WebColor kColorBlack = 0xFF000000;
 
 }  // namespace
 
+CastContentRendererClient::CastContentRendererClient() {
+}
+
+CastContentRendererClient::~CastContentRendererClient() {
+}
+
 void CastContentRendererClient::RenderThreadStarted() {
 #if defined(USE_NSS)
   // Note: Copied from chrome_render_process_observer.cc to fix b/8676652.
   //
   // On platforms where the system NSS shared libraries are used,
   // initialize NSS now because it won't be able to load the .so's
   // after entering the sandbox.
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (!command_line->HasSwitch(switches::kSingleProcess))
     crypto::InitNSSSafely();
 #endif
+
+  prescient_networking_dispatcher_.reset(
+      new dns_prefetch::PrescientNetworkingDispatcher());
 }
 
 void CastContentRendererClient::RenderViewCreated(
     content::RenderView* render_view) {
   blink::WebView* webview = render_view->GetWebView();
   if (webview) {
     webview->setBaseBackgroundColor(kColorBlack);
 
     // The following settings express consistent behaviors across Cast
     // embedders, though Android has enabled by default for mobile browsers.
     webview->settings()->setShrinksViewportContentToFit(false);
     webview->settings()->setMediaControlsOverlayPlayButtonEnabled(false);
   }
 }
 
 void CastContentRendererClient::AddKeySystems(
     std::vector< ::media::KeySystemInfo>* key_systems) {
   AddChromecastKeySystems(key_systems);
   AddChromecastPlatformKeySystems(key_systems);
 }
 
+blink::WebPrescientNetworking*
+CastContentRendererClient::GetPrescientNetworking() {
+  return prescient_networking_dispatcher_.get();
+}
+
 }  // namespace shell
 }  // namespace chromecast