sendNavigationHint with mojo

third_party/WebKit/public/platform/resource_hints.mojom

Index: third_party/WebKit/public/platform/resource_hints.mojom
diff --git a/third_party/WebKit/public/platform/resource_hints.mojom b/third_party/WebKit/public/platform/resource_hints.mojom
index 2d241595d963db1e7356dc11d07713c88a5fb7f0..0212c3265209b72c50539fc8d57cb3fd79842c00 100644
--- a/third_party/WebKit/public/platform/resource_hints.mojom
+++ b/third_party/WebKit/public/platform/resource_hints.mojom
@@ -6,6 +6,12 @@ module blink.mojom;
 
 import "url/mojo/url.mojom";
 
+enum NavigationHintType {
+  LINK_MOUSE_DOWN,
+  LINK_TAP_UNCONFIRMED,
+  LINK_TAP_DOWN,
+};
+
 // The ResourceHintsHandler sends preconnect/preresolve requests based
 // on link tags/headers. See the corresponding interface in
 // content/public/resource_hints.h.
@@ -23,4 +29,7 @@ interface ResourceHintsHandler {
   // Resolves the given URL's host, so subsequent requests will hit the host
   // cache.
   Preresolve(url.mojom.Url url);
+
+  // Send a hint that a navigation to |url| is likely to happen.
+  SendNavigationHint(url.mojom.Url url, NavigationHintType type);
 };