Add WebPrescientNetworking to trigger preconnect from Blink.

Source/Platform/chromium/public/WebPrescientNetworking.h

Index: Source/Platform/chromium/public/WebPrescientNetworking.h
diff --git a/Source/Platform/chromium/public/WebPrerenderingSupport.h b/Source/Platform/chromium/public/WebPrescientNetworking.h
similarity index 58%
copy from Source/Platform/chromium/public/WebPrerenderingSupport.h
copy to Source/Platform/chromium/public/WebPrescientNetworking.h
index a2672911fa50a83358d2bf4b0996fd5493806ba2..7fd1277b1fc8b8a8bada8dcc60cc99e18a0520aa 100644
--- a/Source/Platform/chromium/public/WebPrerenderingSupport.h
+++ b/Source/Platform/chromium/public/WebPrescientNetworking.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Google Inc. All rights reserved.
+ * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -28,40 +28,44 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WebPrerenderingSupport_h
-#define WebPrerenderingSupport_h
+#ifndef WebPrescientNetworking_h
+#define WebPrescientNetworking_h
 
 #include "WebCommon.h"
 
 namespace WebKit {
 
-class WebPrerender;
+class WebURL;
 
-class WebPrerenderingSupport {
+// FIXME (kouhei): Passing preconnect motivation to net is layering vioration.

[abarth-chromium, 2013/05/14 06:18:56]

" (kouhei)" <-- you should delete this part.  We don't put user names in FIXME
comments in Blink.

net -> "the platform".  Blink has no knowledge that a "net" module exists.

[kouhei (in TOK), 2013/05/14 06:34:07]

Done.

+// However, this is done temporarily to perform a Finch field trial to enable
+// preconnect in different triggers one at a time. This enum can be safely
+// removed after the field trial is done.
+enum WebPreconnectMotivation {
+    WebPreconnectMotivationLinkMouseDown,
+    WebPreconnectMotivationLinkMouseOver,
+    WebPreconnectMotivationLinkTapUnconfirmed,
+    WebPreconnectMotivationLinkTapDown,
+};
+
+class WebPrescientNetworking {
 public:
-    WEBKIT_EXPORT static void initialize(WebPrerenderingSupport*);
+    WEBKIT_EXPORT static void initialize(WebPrescientNetworking*);
     WEBKIT_EXPORT static void shutdown();
-    WEBKIT_EXPORT static WebPrerenderingSupport* current();
-
-    // A prerender link element is added when it is inserted into a document.
-    virtual void add(const WebPrerender&) = 0;
-
-    // A prerender is canceled when it is removed from a document.
-    virtual void cancel(const WebPrerender&) = 0;
+    WEBKIT_EXPORT static WebPrescientNetworking* current();

[abarth-chromium, 2013/05/14 06:18:56]

None of these methods are needed.  They should all be removed.

Instead, we should get the WebPrescientNetworking instance from
WebKit::Platform::current().

[kouhei (in TOK), 2013/05/14 06:34:07]

Done.

 
-    // A prerender is abandoned when it's navigated away from or suspended in the page cache. This
-    // is a weaker signal than cancel(), since the launcher hasn't indicated that the prerender isn't
-    // wanted, and we may end up using it after, for instance, a short redirect chain.
-    virtual void abandon(const WebPrerender&) = 0;
+    // When a page navigation is speculated, preconnect is triggered to hide
+    // session initialization latency to the server providing the page resource.
+    virtual void preconnect(const WebURL&, WebPreconnectMotivation) { }
 
 protected:
-    WebPrerenderingSupport() { }
-    virtual ~WebPrerenderingSupport() { }
+    WebPrescientNetworking() { }

[abarth-chromium, 2013/05/14 06:18:56]

No constructor is needed.

[kouhei (in TOK), 2013/05/14 06:34:07]

Done.

+    virtual ~WebPrescientNetworking() { }
 
 private:
-    static WebPrerenderingSupport* s_platform;
+    static WebPrescientNetworking* s_platform;

[abarth-chromium, 2013/05/14 06:18:56]

Please remove the static state from this class.  Instead, this object should be
retrieved from the WebKit::Platform::current static.

[kouhei (in TOK), 2013/05/14 06:34:07]

Done.

 };
 
 } // namespace WebKit
 
-#endif // WebPrerenderingSupport_h
+#endif // WebPrescientNetworking_h