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

public/platform/Platform.h

Index: public/platform/Platform.h
diff --git a/public/platform/Platform.h b/public/platform/Platform.h
index ac0a5b291d9029f6b91c261ccd83ababa5cf4ed3..488720cc951b50b22add969ac8a7cdedf2d44b19 100644
--- a/public/platform/Platform.h
+++ b/public/platform/Platform.h
@@ -66,7 +66,10 @@ class WebClipboard;
 class WebCompositorSupport;
 class WebConvertableToTraceFormat;
 class WebCookieJar;
+class WebCreateDataPipeOptions;
 class WebCrypto;
+class WebDataConsumerHandle;
+class WebDataProducerHandle;
 class WebDatabaseObserver;
 class WebDiscardableMemory;
 class WebPlatformEventListener;
@@ -652,6 +655,11 @@ public:
 
     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() { }
 };