Make OS audio buffer size limits visible.

content/shell/renderer/layout_test/layout_test_content_renderer_client.cc

 // Copyright (c) 2014 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 "content/shell/renderer/layout_test/layout_test_content_renderer_client.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "base/memory/ptr_util.h"
@@ skipping 199 matching lines @@
       break;
     case blink::WebAudioLatencyHint::kCategoryBalanced:
       buffer_size =
           media::AudioLatency::GetRtcBufferSize(hw_sample_rate, hw_buffer_size);
       break;
     case blink::WebAudioLatencyHint::kCategoryPlayback:
       buffer_size =
           media::AudioLatency::GetHighLatencyBufferSize(hw_sample_rate, 0);
       break;
     case blink::WebAudioLatencyHint::kCategoryExact:
-      // TODO(andrew.macpherson@soundtrap.com): http://crbug.com/708917
       buffer_size = std::min(
-          4096, media::AudioLatency::GetExactBufferSize(
-                    base::TimeDelta::FromSecondsD(latency_hint.Seconds()),
-                    hw_sample_rate, hw_buffer_size));
+          media::AudioLatency::GetMaximumAudioBufferSize(hw_sample_rate),
+          media::AudioLatency::GetExactBufferSize(
+              base::TimeDelta::FromSecondsD(latency_hint.Seconds()),
+              hw_sample_rate, hw_buffer_size));
       break;
     default:
       NOTREACHED();
       break;
   }
   test_runner::WebTestInterfaces* interfaces =
       LayoutTestRenderThreadObserver::GetInstance()->test_interfaces();
   return interfaces->CreateAudioDevice(hw_sample_rate, buffer_size);
 }
 
@@ skipping 33 matching lines @@
           switches::kStableReleaseMode)) {
     blink::WebRuntimeFeatures::EnableTestOnlyFeatures(true);
   }
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableFontAntialiasing)) {
     blink::SetFontAntialiasingEnabledForTest(true);
   }
 }
 
 }  // namespace content