Make OS audio buffer size limits visible.

content/renderer/media/renderer_webaudiodevice_impl.cc

Index: content/renderer/media/renderer_webaudiodevice_impl.cc
diff --git a/content/renderer/media/renderer_webaudiodevice_impl.cc b/content/renderer/media/renderer_webaudiodevice_impl.cc
index ef941bec24e00b4c414f38abd6562ecf39c08ba3..31173babc9f55cdfadf004a098af9c97a800f1f1 100644
--- a/content/renderer/media/renderer_webaudiodevice_impl.cc
+++ b/content/renderer/media/renderer_webaudiodevice_impl.cc
@@ -16,6 +16,7 @@
 #include "content/renderer/media/audio_device_factory.h"
 #include "content/renderer/render_frame_impl.h"
 #include "content/renderer/render_thread_impl.h"
+#include "media/audio/audio_manager.h"
 #include "media/base/audio_timestamp_helper.h"
 #include "media/base/silent_sink_suspender.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
@@ -65,12 +66,13 @@ int GetOutputBufferSize(const blink::WebAudioLatencyHint& latency_hint,
           hardware_params.sample_rate(), 0);
       break;
     case media::AudioLatency::LATENCY_EXACT_MS:
-      // TODO(andrew.macpherson@soundtrap.com): http://crbug.com/708917
-      return std::min(4096,
+      return std::min(media::AudioManager::GetMaximumAudioBufferSize(

[o1ka, 2017/05/29 16:11:33]

AudioManager is browser side only entity and cannot be used in the renderer.
Why cannot the code live in AudioLatency?

+                          hardware_params.sample_rate()),
                       media::AudioLatency::GetExactBufferSize(
                           base::TimeDelta::FromSecondsD(latency_hint.Seconds()),
                           hardware_params.sample_rate(),
-                          hardware_params.frames_per_buffer()));
+                          media::AudioManager::GetMinimumAudioBufferSize(
+                              hardware_params.sample_rate())));
       break;
     default:
       NOTREACHED();