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 {

[o1ka, 2016/11/30 11:46:27]

What is the point for using a class here as an extra level of indirection? Why
not to have a bare enum?

[Andrew MacPherson, 2016/12/01 12:11:56]

The thought here is that we will be adding an "exact latency" in seconds in the
next CL and so the function APIs (hopefully) won't need to change as it will
just be a new member on this class.

+ public:
+  enum Category { CategoryInteractive, CategoryBalanced, CategoryPlayback };
+
+  WebAudioLatencyHint(Category category) : m_category(category) {}
+
+  Category category() const { return m_category; }
+
+ private:
+  Category m_category;
+};
+
+}  // namespace blink
+
+#endif