Add WebPrescientNetworking to trigger preconnect from Blink.

Source/Platform/chromium/public/WebPreconnectMotivation.h

Index: Source/Platform/chromium/public/WebPreconnectMotivation.h
diff --git a/Source/WebKit/chromium/public/WebMediaSource.h b/Source/Platform/chromium/public/WebPreconnectMotivation.h
similarity index 85%
copy from Source/WebKit/chromium/public/WebMediaSource.h
copy to Source/Platform/chromium/public/WebPreconnectMotivation.h
index ae7864b3090d45d155dce3a55872d6f6a27830c4..0c4fd537ae7c82ea8ccdd7c4c496640035d5a3da 100644
--- a/Source/WebKit/chromium/public/WebMediaSource.h
+++ b/Source/Platform/chromium/public/WebPreconnectMotivation.h
@@ -28,20 +28,16 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WebMediaSource_h
-#define WebMediaSource_h
-
-#include "../../../Platform/chromium/public/WebURL.h"
-#include "WebTimeRange.h"
+#ifndef WebPreconnectMotivation_h
+#define WebPreconnectMotivation_h
 
 namespace WebKit {
 
-class WebMediaSourceClient;
-
-class WebMediaSource {
-public:
-    virtual ~WebMediaSource() { };
-    virtual void open(WebMediaSourceClient*) = 0;
+enum WebPreconnectMotivation {
+    WebPreconnectMotivationLinkMouseDown,
+    WebPreconnectMotivationLinkMouseOver,
+    WebPreconnectMotivationLinkTapUnconfirmed,
+    WebPreconnectMotivationLinkTapDown,

[abarth-chromium, 2013/05/10 16:57:25]

Technically this is a layering violation.  The Platform layer doesn't have any
concept of a "link", "mouse", or "tap".

What is this used for?  Can we use names that are more descriptive of what the
platform should do with this information?

[kouhei (in TOK), 2013/05/13 01:31:48]

I admit this is some layering violation. However, I would like to have this
temporarily for my purpose.

What I would like to do is a Finch trial to compare effect of preconnects from
different triggers. To do that, I would like to enable preconnect from each
trigger one at a time. However, I couldn't find an interface for FieldTrial
class from Blink, so I am planning to pass this information to predictor, and
proceed with preconnect if the user is in an experiment group.

 };
 
 } // namespace WebKit