Add WebKitUnitTestSupport::readFromFile and deprecate all PlatformFileHandle related methods

public/platform/WebUnitTestSupport.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
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  * modification, are permitted provided that the following conditions
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 #ifndef WebUnitTestSupport_h
 #define WebUnitTestSupport_h
 
 #include "WebCommon.h"
+#include "WebData.h"
 #include "WebString.h"
 
 namespace WebKit {
 
 class WebLayerTreeView;
 class WebURL;
 class WebURLResponse;
 struct WebURLError;
 
 class WebUnitTestSupport {
 public:
     virtual void registerMockedURL(const WebURL&, const WebURLResponse&, const WebString& filePath) { }
 
     // Registers the error to be returned when |url| is requested.
     virtual void registerMockedErrorURL(const WebURL&, const WebURLResponse&, const WebURLError&) { }
 
     // Unregisters URLs so they are no longer mocked.
     virtual void unregisterMockedURL(const WebURL&) { }
     virtual void unregisterAllMockedURLs() { }
 
     // Causes all pending asynchronous requests to be served. When this method
     // returns all the pending requests have been processed.
     virtual void serveAsynchronousMockedRequests() { }
 
     // Returns the root directory of the WebKit code.
     virtual WebString webKitRootDir() { return WebString(); }
 
     // Constructs a WebLayerTreeView set up with reasonable defaults for
     // testing.
+    virtual WebLayerTreeView* createLayerTreeViewForTesting() { return 0; }
 
-    virtual WebLayerTreeView* createLayerTreeViewForTesting() { return 0; }
+    virtual WebData readFromFile(const WebString& path) { return WebData(); }
 
     // DEPRECATED, use the version above.
 #define HAVE_CREATELAYERTREEVIEWFORTESTING 1
     enum TestViewType {
         TestViewTypeUnitTest,
         TestViewTypeLayoutTest
     };
     virtual WebLayerTreeView* createLayerTreeViewForTesting(TestViewType) { return 0; }
 };
 
 }
 
 #endif // WebUnitTestSupport_h