Web MIDI: refine MIDIAccessor and WebMIDIAccessor APIs

public/platform/WebMIDIAccessorClient.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebMIDIAccessorClient_h
 #define WebMIDIAccessorClient_h
 
 #include "WebString.h"
 
 namespace WebKit {
 
-// Abstract client interface to the Chromium MIDI system.
-
 class WebMIDIAccessorClient {
 public:
-    virtual void addInputPort(const WebString& id, const WebString& manufacturer, const WebString& name, const WebString& version) = 0;
-    virtual void addOutputPort(const WebString& id, const WebString& manufacturer, const WebString& name, const WebString& version) = 0;
+    virtual void didAddInputPort(const WebString& id, const WebString& manufacturer, const WebString& name, const WebString& version) = 0;
+    virtual void didAddOutputPort(const WebString& id, const WebString& manufacturer, const WebString& name, const WebString& version) = 0;
 
-    virtual void accessApproved(bool approved) = 0;
-    virtual void receiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp) = 0;
+    virtual void didAllowAccess() = 0;
+    virtual void didBlockAccess() = 0;
+
+    // |timeStamp| is in milliseconds according to the Web MIDI API.
+    virtual void didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp) = 0;
 
 protected:
     virtual ~WebMIDIAccessorClient() { }
 };
 
 } // namespace WebKit
 
 #endif // WebMIDIAccessorClient_h