[DO NOT REVIEW][DO NOT COMMIT] Introduce WebDataProducerHandle.

public/platform/Platform.h

 /*
  * Copyright (C) 2012 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
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 namespace blink {
 
 class WebAudioBus;
 class WebBlobRegistry;
 class WebBluetooth;
 class WebClipboard;
 class WebCompositorSupport;
 class WebConvertableToTraceFormat;
 class WebCookieJar;
+class WebCreateDataPipeOptions;
 class WebCrypto;
+class WebDataConsumerHandle;
+class WebDataProducerHandle;
 class WebDatabaseObserver;
 class WebDiscardableMemory;
 class WebPlatformEventListener;
 class WebFallbackThemeEngine;
 class WebFileSystem;
 class WebFileUtilities;
 class WebFlingAnimator;
 class WebGeofencingProvider;
 class WebGestureCurve;
 class WebGraphicsContext3DProvider;
@@ skipping 565 matching lines @@
 
     // Push API------------------------------------------------------------
 
     virtual WebPushProvider* pushProvider() { return 0; }
 
 
     // navigator.connect --------------------------------------------------
 
     virtual WebNavigatorConnectProvider* navigatorConnectProvider() { return 0; }
 
+    // |options| can be null. The default option is used in such a case.
+    // Creates a producer handle and a consumer handle, and stores them into
+    // the output parameters. Returns true when the operation succeeds.
+    virtual bool createDataPipe(const WebCreateDataPipeOptions* /* options */, WebDataProducerHandle**, WebDataConsumerHandle**) { return false; }
+
 protected:
     virtual ~Platform() { }
 };
 
 } // namespace blink
 
 #endif