Support AudioContextOptions latencyHint as double.

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

 // Copyright 2015 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 "modules/webaudio/AudioContext.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
@@ skipping 35 matching lines @@
         NotSupportedError, ExceptionMessages::indexExceedsMaximumBound(
                                "number of hardware contexts",
                                s_hardwareContextCount, MaxHardwareContexts));
     return nullptr;
   }
 
   WebAudioLatencyHint latencyHint(WebAudioLatencyHint::kCategoryInteractive);
   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();
 
   if (!AudioUtilities::isValidAudioBufferSampleRate(
           audioContext->sampleRate())) {
     exceptionState.throwDOMException(
         NotSupportedError,
         ExceptionMessages::indexOutsideRange(
             "hardware sample rate", audioContext->sampleRate(),
@@ skipping 186 matching lines @@
     setContextState(Suspended);
     deferredTaskHandler().clearHandlersToBeDeleted();
   }
 }
 
 double AudioContext::baseLatency() const {
   return framesPerBuffer() * 2 / static_cast<double>(sampleRate());
 }
 
 }  // namespace blink