Patch 3 in the series.

WebKit/chromium/src/WebFileSystemCallbacksImpl.h

Index: WebKit/chromium/src/WebFileSystemCallbacksImpl.h
===================================================================
--- WebKit/chromium/src/WebFileSystemCallbacksImpl.h	(revision 141735)
+++ WebKit/chromium/src/WebFileSystemCallbacksImpl.h	(working copy)
@@ -40,6 +40,7 @@
 
 namespace WebCore {
 class AsyncFileSystemCallbacks;
+class BlobDataHandle;
 class ScriptExecutionContext;
 }
 
@@ -57,10 +58,16 @@
 
     virtual void didSucceed();
     virtual void didReadMetadata(const WebFileInfo& info);
+    virtual void didCreateSnapshotFile(const WebFileInfo& info);
     virtual void didReadDirectory(const WebVector<WebFileSystemEntry>& entries, bool hasMore);
     virtual void didOpenFileSystem(const WebString& name, const WebURL& rootURL);
     virtual void didFail(WebFileError error);
 
+    // This internal overload is used by WorkerFileSystemCallbacksBridge to deliver a blob data handle
+    // created on the main thread to an  AsyncFileSystemCallback on a background worker thread. The other
+    // virtual method is invoked by the embedder.
+    void didCreateSnapshotFile(const WebFileInfo& info, PassRefPtr<WebCore::BlobDataHandle> snapshot);
+
 private:
     OwnPtr<WebCore::AsyncFileSystemCallbacks> m_callbacks;