Support for AudioContextOptions latencyHint.

third_party/WebKit/public/platform/WebAudioLatencyHint.h

Index: third_party/WebKit/public/platform/WebAudioLatencyHint.h
diff --git a/third_party/WebKit/public/platform/WebAudioLatencyHint.h b/third_party/WebKit/public/platform/WebAudioLatencyHint.h
new file mode 100644
index 0000000000000000000000000000000000000000..55a6022d55bf577960356e387cb26ec1f1ab943d
--- /dev/null
+++ b/third_party/WebKit/public/platform/WebAudioLatencyHint.h
@@ -0,0 +1,24 @@
+// 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 WebAudioLatencyHint_h
+#define WebAudioLatencyHint_h
+
+namespace blink {
+
+class WebAudioLatencyHint {
+ public:
+  enum Category { CategoryInteractive, CategoryBalanced, CategoryPlayback };
+
+  WebAudioLatencyHint(Category category) : m_category(category) {}

[o1ka, 2016/12/02 12:02:13]

Not sure about WebKit, but in Chromium single-parameter constructors are always
explicit
(https://google.github.io/styleguide/cppguide.html#Implicit_Conversions)

[Andrew MacPherson, 2016/12/05 14:12:53]

Done.

+
+  Category category() const { return m_category; }
+
+ private:
+  Category m_category;
+};
+
+}  // namespace blink
+
+#endif