Support AudioContextOptions latencyHint as double.

media/base/audio_latency.cc

Index: media/base/audio_latency.cc
diff --git a/media/base/audio_latency.cc b/media/base/audio_latency.cc
index 5d37edf415213ff72aeb6e9753927abf1dfb8894..bac977c53ab256034f411f7d22a95e4ef8ff3687 100644
--- a/media/base/audio_latency.cc
+++ b/media/base/audio_latency.cc
@@ -126,4 +126,11 @@ int AudioLatency::GetInteractiveBufferSize(int hardware_buffer_size) {
   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