Implement WebPrescientNetworking to trigger preconnect from Blink

content/renderer/renderer_webkitplatformsupport_impl.cc

 // 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.
 
 #include "content/renderer/renderer_webkitplatformsupport_impl.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/metrics/histogram.h"
@@ skipping 277 matching lines @@
     const WebString& hostname) {
   if (hostname.isEmpty())
     return;
 
   std::string hostname_utf8;
   UTF16ToUTF8(hostname.data(), hostname.length(), &hostname_utf8);
   GetContentClient()->renderer()->PrefetchHostName(
       hostname_utf8.data(), hostname_utf8.length());
 }
 
+WebKit::WebPrescientNetworking*
+RendererWebKitPlatformSupportImpl::prescientNetworking() {
+  return GetContentClient()->renderer()->PrescientNetworking();
+}
+
 bool
 RendererWebKitPlatformSupportImpl::CheckPreparsedJsCachingEnabled() const {
   static bool checked = false;
   static bool result = false;
   if (!checked) {
     const CommandLine& command_line = *CommandLine::ForCurrentProcess();
     result = command_line.HasSwitch(switches::kEnablePreparsedJsCaching);
     checked = true;
   }
   return result;
@@ skipping 609 matching lines @@
     shared_offscreen_context_ =
         RenderThreadImpl::current()->OffscreenContextProviderForMainThread();
   }
   if (!shared_offscreen_context_)
     return NULL;
   return new webkit::gpu::WebGraphicsContext3DProviderImpl(
       shared_offscreen_context_);
 }
 
 }  // namespace content