Initial Fetch integration for Subresource Integrity

Source/modules/fetch/Request.idl

Index: Source/modules/fetch/Request.idl
diff --git a/Source/modules/fetch/Request.idl b/Source/modules/fetch/Request.idl
index 7d226aa3b03616bd408a25cf3a4f5f4c12b5198a..c9e40c4ef0b3cc34f689d7f68d66c5563e8715f1 100644
--- a/Source/modules/fetch/Request.idl
+++ b/Source/modules/fetch/Request.idl
@@ -36,6 +36,7 @@ enum RequestCredentials { "omit", "same-origin", "include" };
     readonly attribute RequestCredentials credentials;
     // TODO(horo): Support redirect attribute when the chromium side patch land.
     // readonly attribute RequestRedirect redirect;
+    readonly attribute DOMString integrity;
 
     [RaisesException] Request clone();
 };