Add brotli content-encoding filter.

net/http/http_features.cc

Index: net/http/http_features.cc
diff --git a/net/http/http_features.cc b/net/http/http_features.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f430be361ee60c6f80f543fe8a9584fd871eca77
--- /dev/null
+++ b/net/http/http_features.cc
@@ -0,0 +1,25 @@
+// Copyright 2015 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.
+
+#include "net/http/http_features.h"
+
+namespace net {
+
+namespace features {
+
+// Enables brotli "Accept-Encooding" advertising and "Content-Encoding" support.

[xunjieli, 2015/12/14 16:02:27]

Could you also link ietf draft here?
http://www.ietf.org/id/draft-alakuijala-brotli

[xunjieli, 2015/12/14 16:02:27]

nit: typo in Encoding

[eustas, 2015/12/14 17:39:45]

Done.

[eustas, 2015/12/14 17:39:45]

Done.

+const base::Feature kBrotliEncodingFeature = {
+    "brotli-encoding", base::FEATURE_DISABLED_BY_DEFAULT};
+
+bool IsBrotliEncodingEnabled() {
+#if !defined(DISABLE_BROTLI_SUPPORT)
+  return base::FeatureList::IsEnabled(kBrotliEncodingFeature);
+#else
+  return false;
+#endif
+}
+
+}  // namespace features
+
+}  // namespace net