Support AudioContextOptions latencyHint as double.

third_party/WebKit/Source/modules/webaudio/AudioContext.cpp

Index: third_party/WebKit/Source/modules/webaudio/AudioContext.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioContext.cpp b/third_party/WebKit/Source/modules/webaudio/AudioContext.cpp
index 4813a821ca2a026289282b9bd70bfca354b2ad3d..4b36b512a1a3ce0f23a33ff3e94ced61b2237209 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioContext.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/AudioContext.cpp
@@ -53,8 +53,10 @@ AudioContext* AudioContext::create(Document& document,
   if (contextOptions.latencyHint().isAudioContextLatencyCategory()) {
     latencyHint = WebAudioLatencyHint(
         contextOptions.latencyHint().getAsAudioContextLatencyCategory());
+  } else if (contextOptions.latencyHint().isDouble()) {
+    latencyHint =
+        WebAudioLatencyHint(contextOptions.latencyHint().getAsDouble());
   }
-  // TODO: add support for latencyHint().isDouble()
 
   AudioContext* audioContext = new AudioContext(document, latencyHint);
   audioContext->suspendIfNeeded();