Support AudioContextOptions latencyHint as double.

content/renderer/renderer_blink_platform_impl.cc

 // Copyright (c) 2012 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/renderer/renderer_blink_platform_impl.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 657 matching lines @@
 
 WebAudioDevice* RendererBlinkPlatformImpl::createAudioDevice(
     unsigned input_channels,
     unsigned channels,
     const blink::WebAudioLatencyHint& latency_hint,
     WebAudioDevice::RenderCallback* callback,
     const blink::WebString& input_device_id,
     const blink::WebSecurityOrigin& security_origin) {
   // Use a mock for testing.
   blink::WebAudioDevice* mock_device =
-      GetContentClient()->renderer()->OverrideCreateAudioDevice();
+      GetContentClient()->renderer()->OverrideCreateAudioDevice(latency_hint);
   if (mock_device)
     return mock_device;
 
   // The |channels| does not exactly identify the channel layout of the
   // device. The switch statement below assigns a best guess to the channel
   // layout based on number of channels.
   media::ChannelLayout layout = media::GuessChannelLayout(channels);
   if (layout == media::CHANNEL_LAYOUT_UNSUPPORTED)
     layout = media::CHANNEL_LAYOUT_DISCRETE;
 
@@ skipping 585 matching lines @@
 //------------------------------------------------------------------------------
 void RendererBlinkPlatformImpl::requestPurgeMemory() {
   // TODO(tasak|bashi): We should use ChildMemoryCoordinator here, but
   // ChildMemoryCoordinator isn't always available as it's only initialized
   // when kMemoryCoordinatorV0 is enabled.
   // Use ChildMemoryCoordinator when memory coordinator is always enabled.
   base::MemoryCoordinatorClientRegistry::GetInstance()->PurgeMemory();
 }
 
 }  // namespace content