Add dictionary for OfflineAudioContext constructor

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

Index: third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp b/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp
index 257fc90d4a32dcd4c341fc526ae621a5f549342d..876ddcb40fc8ec8a419b3f05e27659be86fcef5e 100644
--- a/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp
@@ -33,6 +33,7 @@
 #include "modules/webaudio/AudioListener.h"
 #include "modules/webaudio/DeferredTaskHandler.h"
 #include "modules/webaudio/OfflineAudioCompletionEvent.h"
+#include "modules/webaudio/OfflineAudioContextOptions.h"
 #include "modules/webaudio/OfflineAudioDestinationNode.h"
 #include "platform/bindings/ScriptState.h"
 
@@ -128,6 +129,17 @@ OfflineAudioContext* OfflineAudioContext::Create(
   return audio_context;
 }
 
+OfflineAudioContext* OfflineAudioContext::Create(
+    ExecutionContext* context,
+    const OfflineAudioContextOptions& options,
+    ExceptionState& exception_state) {
+  OfflineAudioContext* offline_context =
+      Create(context, options.numberOfChannels(), options.length(),
+             options.sampleRate(), exception_state);
+
+  return offline_context;
+}
+
 OfflineAudioContext::OfflineAudioContext(Document* document,
                                          unsigned number_of_channels,
                                          size_t number_of_frames,