Introduce AsyncDocumentSubresourceFilter.

third_party/WebKit/public/platform/WebDocumentSubresourceFilterLoadPolicy.h

Index: third_party/WebKit/public/platform/WebDocumentSubresourceFilterLoadPolicy.h
diff --git a/third_party/WebKit/public/platform/WebDocumentSubresourceFilterLoadPolicy.h b/third_party/WebKit/public/platform/WebDocumentSubresourceFilterLoadPolicy.h
new file mode 100644
index 0000000000000000000000000000000000000000..eecb0528ee0ec3a452fc65ce0c00ce86b1586d49
--- /dev/null
+++ b/third_party/WebKit/public/platform/WebDocumentSubresourceFilterLoadPolicy.h
@@ -0,0 +1,18 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WebDocumentSubresourceFilterLoadPolicy_h
+#define WebDocumentSubresourceFilterLoadPolicy_h
+
+namespace blink {
+
+enum class WebDocumentSubresourceFilterLoadPolicy {
+  Allow,

[jochen (gone - plz use gerrit), 2017/02/16 14:46:21]

please prefix enum constants with k

[pkalinnikov, 2017/02/17 17:51:38]

I will make it in a separate fixup CL.

+  Disallow,
+  WouldDisallow
+};
+
+}  // namespace blink
+
+#endif  // WebDocumentSubresourceFilterLoadPolicy_h