[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 be369762a4f30d439fe7a48569e884b6694368f9..d87938f6d13138d6747d2aa04e8051ca424f4e7a 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;
@@ -647,6 +650,11 @@ 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 store them into

[tyoshino (SeeGerritForStatus), 2015/01/23 08:24:20]

stores

[yhirano, 2015/01/23 10:49:02]

Done.

+    // the output parameters. Returns true when the operation succeeds.
+    virtual bool createDataPipe(const WebCreateDataPipeOptions* /* options */, WebDataProducerHandle**, WebDataConsumerHandle**) { return false; }
+
 protected:
     virtual ~Platform() { }
 };