Move MediaStreamTrack contentHint to separate IDL.

third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.h

Index: third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.h
diff --git a/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.h b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.h
new file mode 100644
index 0000000000000000000000000000000000000000..74b193f7f2cfc50efa34d4bef34f1d68ec22fe0b
--- /dev/null
+++ b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.h
@@ -0,0 +1,22 @@
+// Copyright 2016 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 MediaStreamTrackContentHint_h
+#define MediaStreamTrackContentHint_h
+
+#include "wtf/Forward.h"
+
+namespace blink {
+
+class MediaStreamTrack;
+
+class MediaStreamTrackContentHint final {
+ public:
+  static String contentHint(const MediaStreamTrack&);
+  static void setContentHint(MediaStreamTrack&, const String&);

[mcasas, 2016/12/14 17:38:01]

Since these two methods' implementations are
tiny and this header is of limited use to 
Source/modules/mediastream/, you could 
consider inlining their bodies.

[pbos, 2016/12/14 18:18:52]

Done, I misremembered that I should out-of-line them but that's for virtual
methods.

+};
+
+}  // namespace blink
+
+#endif  // MediaStreamTrack_h