Web MIDI: introduce WebMIDIClient API to request a permission

public/web/WebViewClient.h

 /*
  * Copyright (C) 2009 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 51 matching lines @@
 class WebFrame;
 class WebGeolocationClient;
 class WebGeolocationService;
 class WebGestureEvent;
 class WebHelperPlugin;
 class WebHitTestResult;
 class WebIconLoadingCompletion;
 class WebImage;
 class WebInputElement;
 class WebKeyboardEvent;
+class WebMIDIClient;
 class WebNode;
 class WebNotificationPresenter;
 class WebRange;
 class WebSpeechInputController;
 class WebSpeechInputListener;
 class WebSpeechRecognizer;
 class WebStorageNamespace;
 class WebURL;
 class WebURLRequest;
 class WebUserMediaClient;
@@ skipping 285 matching lines @@
     // Returns the current visibility of the WebView.
     virtual WebPageVisibilityState visibilityState() const
     {
         return WebPageVisibilityStateVisible;
     }
 
     // Media Streams -------------------------------------------------------
 
     virtual WebUserMediaClient* userMediaClient() { return 0; }
 
+    // Web MIDI -------------------------------------------------------------
+
+    virtual WebMIDIClient* webMIDIClient() { return 0; }
+
 
     // Content detection ----------------------------------------------------
 
     // Retrieves detectable content (e.g., email addresses, phone numbers)
     // around a hit test result. The embedder should use platform-specific
     // content detectors to analyze the region around the hit test result.
     virtual WebContentDetectionResult detectContentAround(const WebHitTestResult&) { return WebContentDetectionResult(); }
 
     // Schedules a new content intent with the provided url.
     virtual void scheduleContentIntent(const WebURL&) { }
 
     // Cancels any previously scheduled content intents that have not yet launched.
     virtual void cancelScheduledContentIntents() { }
 
     // Draggable regions ----------------------------------------------------
 
     // Informs the browser that the draggable regions have been updated.
     virtual void draggableRegionsChanged() { }
 
 protected:
     ~WebViewClient() { }
 };
 
 } // namespace WebKit
 
 #endif