Implement WebPrescientNetworking to trigger preconnect from Blink

content/renderer/renderer_webkitplatformsupport_impl.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_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
 #include "content/common/content_export.h"
 #include "content/common/webkitplatformsupport_impl.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBFactory.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPreconnectMotivation.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebSharedWorkerRepository.h"
 
 namespace cc {
 class ContextProvider;
 }
 
 namespace webkit_glue {
 class WebClipboardImpl;
 }
 
@@ skipping 20 matching lines @@
   virtual WebKit::WebSandboxSupport* sandboxSupport();
   virtual WebKit::WebCookieJar* cookieJar();
   virtual WebKit::WebHyphenator* hyphenator();
   virtual WebKit::WebThemeEngine* themeEngine();
   virtual bool sandboxEnabled();
   virtual unsigned long long visitedLinkHash(
       const char* canonicalURL, size_t length);
   virtual bool isLinkVisited(unsigned long long linkHash);
   virtual WebKit::WebMessagePortChannel* createMessagePortChannel();
   virtual void prefetchHostName(const WebKit::WebString&);
+  virtual void preconnect(const WebKit::WebURL& url,

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

this method and the above (prefetchHostName) are just pass-throughs to the
embedder. it seems that coneptually they're related to, although I realize
aren't the same thing as, prerendering. can we put them on WebPrerendererClient?
that way we wouldn't have to change content for these chrome-specific features.
we can rename the interface to something more generic if needed

[kouhei (in TOK), 2013/05/02 10:15:25]

prefetchHostName was not a chrome specific feature (in WebKit days), but I think
preconnect is a chrome specific feature.

I agree that all these conceptually related prefetch methods (prefetchHostName,
preconnect, prerender) should be organlized.

I'll try if these would fit in WebPrerendererClient.

[kouhei (in TOK), 2013/05/07 09:16:12]

Updated the patch to use WebPrerenderingSupport instead of the platform API.

+                          WebKit::WebPreconnectMotivation motivation,
+                          uint32_t motivationVariationId);
   virtual void cacheMetadata(
       const WebKit::WebURL&, double, const char*, size_t);
   virtual WebKit::WebString defaultLocale();
   virtual void suddenTerminationChanged(bool enabled);
   virtual WebKit::WebStorageNamespace* createLocalStorageNamespace(
       const WebKit::WebString& path, unsigned quota);
   virtual WebKit::Platform::FileHandle databaseOpenFile(
       const WebKit::WebString& vfs_file_name, int desired_flags);
   virtual int databaseDeleteFile(const WebKit::WebString& vfs_file_name,
                                  bool sync_dir);
@@ skipping 99 matching lines @@
   scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
 
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 
   scoped_refptr<cc::ContextProvider> shared_offscreen_context_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_