Support AudioContextOptions latencyHint as double.

media/base/audio_latency.cc

 // 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.
 
 #include "media/base/audio_latency.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 
@@ skipping 108 matching lines @@
   // the jitter.
   const int kSmallBufferSize = 1024;
   const int kDefaultCallbackBufferSize = 2048;
   if (hardware_buffer_size <= kSmallBufferSize)
     return kDefaultCallbackBufferSize;
 #endif
 
   return hardware_buffer_size;
 }
 
+int AudioLatency::GetExactBufferSize(int preferred_buffer_size,

[o1ka, 2017/03/16 10:51:24]

Take a look at AudioLatency::GetHighLatencyBufferSize(): I'm not sure if every
platform will be happy with a buffer size like 101, for example. This needs some
investigation and testing. 

[Andrew MacPherson, 2017/03/16 17:02:09]

Interesting, should we do this for Exact then (use a power of 2) or should the
testing be done first to confirm that it's an issue? Would the browser tests you
mentioned in the earlier comment be enough to cover this?

[o1ka, 2017/03/17 11:17:22]

dalecurtis@ - WDYT?

+                                     int min_buffer_size,
+                                     int max_buffer_size) {
+  return std::max(std::min(preferred_buffer_size, max_buffer_size),
+                  min_buffer_size);
+}
+
 }  // namespace media