Implement WebPrescientNetworking to trigger preconnect from Blink

net/http/http_request_info.h

Index: net/http/http_request_info.h
diff --git a/net/http/http_request_info.h b/net/http/http_request_info.h
index 1f8c80c127bd1f434e55f17224e5ac98153b3c07..ced0c84f9ead8e26fb913c54ae07c84df50e707b 100644
--- a/net/http/http_request_info.h
+++ b/net/http/http_request_info.h
@@ -25,6 +25,14 @@ struct NET_EXPORT HttpRequestInfo {
     EARLY_LOAD_MOTIVATED,  // When browser asks a tab to open an URL, this short
                            // circuits that path (of waiting for the renderer to
                            // do the URL request), and starts loading ASAP.
+    MOUSE_OVER_MOTIVATED,  // Request was motivated by a preconnect
+                           // from link mouseover
+    MOUSE_DOWN_MOTIVATED,  // Request was motivated by a preconnect
+                           // from link mousedown
+    TAP_UNCONFIRMED_MOTIVATED, // Request was motivated by a preconnect
+                           // from link unconfirmed tap
+    TAP_DOWN_MOTIVATED,    // Request was motivated by a preconnect
+                           // from link tapdown
   };
 
   HttpRequestInfo();