Support for AudioContextOptions latencyHint.

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

Index: third_party/WebKit/Source/modules/webaudio/OfflineAudioDestinationNode.h
diff --git a/third_party/WebKit/Source/modules/webaudio/OfflineAudioDestinationNode.h b/third_party/WebKit/Source/modules/webaudio/OfflineAudioDestinationNode.h
index 64cbbb3aacaed9be593c41f26be3f4d0fd06664e..d8073ce6820eb03df3cf11ed57c38d7ba89f70cf 100644
--- a/third_party/WebKit/Source/modules/webaudio/OfflineAudioDestinationNode.h
+++ b/third_party/WebKit/Source/modules/webaudio/OfflineAudioDestinationNode.h
@@ -63,7 +63,11 @@ class OfflineAudioDestinationHandler final : public AudioDestinationHandler {
   // called.
   size_t callbackBufferSize() const override;
 
-  float sampleRate() const override { return m_renderTarget->sampleRate(); }
+  double sampleRate() const override { return m_renderTarget->sampleRate(); }
+  int framesPerBuffer() const override {
+    NOTREACHED();
+    return 0;
+  }
 
   size_t renderQuantumFrames() const {
     return AudioUtilities::kRenderQuantumFrames;