Support for AudioContextOptions latencyHint.

third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h

Index: third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
diff --git a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
index 028ff3e9bb670b6388e9f3fdcf543aca528f0304..fe90872d2fedd50a487db66a4211df7d38af7ff4 100644
--- a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
+++ b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
@@ -52,6 +52,7 @@ class AnalyserNode;
 class AudioBuffer;
 class AudioBufferCallback;
 class AudioBufferSourceNode;
+class AudioContextOptions;
 class AudioListener;
 class BaseAudioContextTest;
 class BiquadFilterNode;
@@ -100,7 +101,9 @@ class MODULES_EXPORT BaseAudioContext : public EventTargetWithInlineData,
   enum AudioContextState { Suspended, Running, Closed };
 
   // Create an AudioContext for rendering to the audio hardware.
-  static BaseAudioContext* create(Document&, ExceptionState&);
+  static BaseAudioContext* create(Document&,
+                                  const AudioContextOptions&,
+                                  ExceptionState&);
 
   ~BaseAudioContext() override;
 
@@ -137,7 +140,15 @@ class MODULES_EXPORT BaseAudioContext : public EventTargetWithInlineData,
   }
 
   float sampleRate() const {
-    return m_destinationNode ? m_destinationNode->handler().sampleRate() : 0;
+    return m_destinationNode
+               ? m_destinationNode->audioDestinationHandler().sampleRate()
+               : closedContextSampleRate();
+  }
+
+  float framesPerBuffer() const {
+    return m_destinationNode
+               ? m_destinationNode->audioDestinationHandler().framesPerBuffer()
+               : 0;
   }
 
   String state() const;