Ensure that FrameLoadTypeBackForward only occurs once per navigation.

Source/web/tests/WebViewTest.cpp

 /*
  * Copyright (C) 2011, 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
@@ skipping 880 matching lines @@
     // Emulate a user scroll
     webViewImpl->setMainFrameScrollOffset(WebPoint(0, 900));
     LocalFrame* mainFrameLocal = toLocalFrame(webViewImpl->page()->mainFrame());
     RefPtr<HistoryItem> item1 = mainFrameLocal->loader().currentItem();
 
     // Click an anchor
     mainFrameLocal->loader().load(FrameLoadRequest(mainFrameLocal->document(), ResourceRequest(mainFrameLocal->document()->completeURL("#a"))));
     RefPtr<HistoryItem> item2 = mainFrameLocal->loader().currentItem();
 
     // Go back, then forward, then back again.
-    mainFrameLocal->loader().loadHistoryItem(item1.get(), HistorySameDocumentLoad);
-    mainFrameLocal->loader().loadHistoryItem(item2.get(), HistorySameDocumentLoad);
-    mainFrameLocal->loader().loadHistoryItem(item1.get(), HistorySameDocumentLoad);
+    mainFrameLocal->loader().loadHistoryItem(item1.get(), FrameLoadTypeBackForward, HistorySameDocumentLoad);
+    mainFrameLocal->loader().loadHistoryItem(item2.get(), FrameLoadTypeBackForward, HistorySameDocumentLoad);
+    mainFrameLocal->loader().loadHistoryItem(item1.get(), FrameLoadTypeBackForward, HistorySameDocumentLoad);
 
     // Click a different anchor
     mainFrameLocal->loader().load(FrameLoadRequest(mainFrameLocal->document(), ResourceRequest(mainFrameLocal->document()->completeURL("#b"))));
     RefPtr<HistoryItem> item3 = mainFrameLocal->loader().currentItem();
 
     // Go back, then forward. The scroll position should be properly set on the forward navigation.
-    mainFrameLocal->loader().loadHistoryItem(item1.get(), HistorySameDocumentLoad);
-    mainFrameLocal->loader().loadHistoryItem(item3.get(), HistorySameDocumentLoad);
+    mainFrameLocal->loader().loadHistoryItem(item1.get(), FrameLoadTypeBackForward, HistorySameDocumentLoad);
+    mainFrameLocal->loader().loadHistoryItem(item3.get(), FrameLoadTypeBackForward, HistorySameDocumentLoad);
     EXPECT_EQ(0, webViewImpl->mainFrame()->scrollOffset().width);
     EXPECT_GT(webViewImpl->mainFrame()->scrollOffset().height, 2000);
 }
 
 class EnterFullscreenWebViewClient : public FrameTestHelpers::TestWebViewClient {
 public:
     // WebViewClient methods
     virtual bool enterFullScreen() { return true; }
     virtual void exitFullScreen() { }
 };
@@ skipping 1294 matching lines @@
     loadFrame(webView->mainFrame(), url);
 
     FrameView* frameView = m_webViewHelper.webViewImpl()->mainFrameImpl()->frameView();
 
     // Auto-resizing used to ASSERT(needsLayout()) in RenderBlockFlow::layout. This EXPECT is
     // merely a dummy. The real test is that we don't trigger asserts in debug builds.
     EXPECT_FALSE(frameView->needsLayout());
 };
 
 } // namespace