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 83f67adc8194532afb39109ce0206b930d20f1e3..3cdc05260233157307ab79a6339b472b145d4c78 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();
 };