Implement WebPrescientNetworking to trigger preconnect from Blink

chrome/browser/net/preconnect.cc

Index: chrome/browser/net/preconnect.cc
diff --git a/chrome/browser/net/preconnect.cc b/chrome/browser/net/preconnect.cc
index d57b82adf61a12150c5a6646058fe2c584f2d430..c9c86a2712e613d99d11bd12d766bb92fcaa6ed6 100644
--- a/chrome/browser/net/preconnect.cc
+++ b/chrome/browser/net/preconnect.cc
@@ -86,6 +86,18 @@ void PreconnectOnIOThread(
     case UrlInfo::EARLY_LOAD_MOTIVATED:
       request_info.motivation = net::HttpRequestInfo::EARLY_LOAD_MOTIVATED;
       break;
+    case UrlInfo::MOUSE_OVER_MOTIVATED:
+      request_info.motivation = net::HttpRequestInfo::MOUSE_OVER_MOTIVATED;
+      break;
+    case UrlInfo::MOUSE_DOWN_MOTIVATED:
+      request_info.motivation = net::HttpRequestInfo::MOUSE_DOWN_MOTIVATED;
+      break;
+    case UrlInfo::TAP_UNCONFIRMED_MOTIVATED:
+      request_info.motivation = net::HttpRequestInfo::TAP_UNCONFIRMED_MOTIVATED;
+      break;
+    case UrlInfo::TAP_DOWN_MOTIVATED:
+      request_info.motivation = net::HttpRequestInfo::TAP_DOWN_MOTIVATED;
+      break;
     default:
       // Other motivations should never happen here.
       NOTREACHED();