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 d544fb7fb58f3fa2d473792f4156023afed79658..4fed0b563914910bd1e831843d58c5377bacc203 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -34,6 +34,7 @@ class FilePath;
 
 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.