Support AudioContextOptions latencyHint as double.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index 78543f883ce061fd47b90459db6f184551651c57..aa460c2dac5fce377acb438b0e57ac2bc54781fe 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -34,6 +34,7 @@ class SchedulerWorkerPoolParams;
 
 namespace blink {
 class WebAudioDevice;
+class WebAudioLatencyHint;
 class WebClipboard;
 class WebFrame;
 class WebLocalFrame;
@@ -171,7 +172,8 @@ class CONTENT_EXPORT ContentRendererClient {
 
   // Allows the embedder to override creating a WebAudioDevice.  If it
   // returns NULL the content layer will create the audio device.
-  virtual blink::WebAudioDevice* OverrideCreateAudioDevice();
+  virtual blink::WebAudioDevice* OverrideCreateAudioDevice(
+      const blink::WebAudioLatencyHint& latency_hint);
 
   // Allows the embedder to override the blink::WebClipboard used. If it
   // returns NULL the content layer will handle clipboard interactions.