Implement WebPrescientNetworking to trigger preconnect from Blink

content/public/renderer/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_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 
 #include <string>
 
 #include "base/string16.h"
 #include "base/memory/weak_ptr.h"
 #include "ipc/ipc_message.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/page_transition_types.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNavigationPolicy.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNavigationType.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPageVisibilityState.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPreconnectMotivation.h"
 #include "v8/include/v8.h"
 
 class GURL;
 class SkBitmap;
 
 namespace base {
 class FilePath;
 class MessageLoop;
 }
 
@@ skipping 170 matching lines @@
                                       int world_id) {}
   virtual void WillReleaseScriptContext(WebKit::WebFrame* frame,
                                         v8::Handle<v8::Context>,
                                         int world_id) {}
 
   // See WebKit::Platform.
   virtual unsigned long long VisitedLinkHash(const char* canonical_url,
                                              size_t length);
   virtual bool IsLinkVisited(unsigned long long link_hash);
   virtual void PrefetchHostName(const char* hostname, size_t length) {}
+  virtual void Preconnect(const GURL& url,
+                          WebKit::WebPreconnectMotivation motivation,
+                          uint32_t motivationVariationId) {}

[jam, 2013/05/01 14:58:11]

nit: google c++ naming style (i.e. motivation_variation_id)

   virtual bool ShouldOverridePageVisibilityState(
       const RenderView* render_view,
       WebKit::WebPageVisibilityState* override_state) const;
 
   // Return true if the GetCookie request will be handled by the embedder.
   // Cookies are returned in the cookie parameter.
   virtual bool HandleGetCookieRequest(RenderView* sender,
                                       const GURL& url,
                                       const GURL& first_party_for_cookies,
                                       std::string* cookies);
@@ skipping 16 matching lines @@
   // RenderThreadImpl. If NULL, then a new thread will be created.
   virtual base::MessageLoop* OverrideCompositorMessageLoop() const;
 
   // Allow the embedder to disable input event filtering by the compositor.
   virtual bool ShouldCreateCompositorInputHandler() const;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_