Reland of permissions: remove duplicates from request multiple at the Blink level

third_party/WebKit/Source/modules/permissions/PermissionsCallback.h

Index: third_party/WebKit/Source/modules/permissions/PermissionsCallback.h
diff --git a/third_party/WebKit/Source/modules/permissions/PermissionsCallback.h b/third_party/WebKit/Source/modules/permissions/PermissionsCallback.h
index feef2872bb09a55814d50f4825eef681094489fe..3800a78e4ed2ca609fd1bb2fd57694b8764488f4 100644
--- a/third_party/WebKit/Source/modules/permissions/PermissionsCallback.h
+++ b/third_party/WebKit/Source/modules/permissions/PermissionsCallback.h
@@ -26,7 +26,7 @@
 class PermissionsCallback final
     : public WebCallbacks<WebPassOwnPtr<WebVector<WebPermissionStatus>>, void> {
 public:
-    PermissionsCallback(ScriptPromiseResolver*, PassOwnPtr<WebVector<WebPermissionType>>);
+    PermissionsCallback(ScriptPromiseResolver*, PassOwnPtr<Vector<WebPermissionType>>, PassOwnPtr<Vector<int>>);
     ~PermissionsCallback() = default;
 
     void onSuccess(WebPassOwnPtr<WebVector<WebPermissionStatus>>) override;
@@ -34,7 +34,14 @@
 
 private:
     Persistent<ScriptPromiseResolver> m_resolver;
-    OwnPtr<WebVector<WebPermissionType>> m_permissionTypes;
+
+    // The permission types which were passed to the client to be requested.
+    OwnPtr<Vector<WebPermissionType>> m_internalPermissions;
+
+    // Maps each index in the caller vector to the corresponding index in the
+    // internal vector (i.e. the vector passsed to the client) such that both
+    // indices have the same WebPermissionType.
+    OwnPtr<Vector<int>> m_callerIndexToInternalIndex;
 
     WTF_MAKE_NONCOPYABLE(PermissionsCallback);
 };