Use float for scroll offset.

third_party/WebKit/Source/web/tests/ProgrammaticScrollTest.cpp

 #include "core/frame/FrameView.h"
 #include "core/loader/DocumentLoader.h"
 #include "core/loader/FrameLoader.h"
 #include "platform/testing/URLTestHelpers.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebURLLoaderMockFactory.h"
 #include "public/web/WebCache.h"
 #include "public/web/WebFrame.h"
 #include "public/web/WebFrameClient.h"
 #include "public/web/WebHistoryItem.h"
@@ skipping 38 matching lines @@
   webView->updateAllLifecyclePhases();
 
   WebViewImpl* webViewImpl = toWebViewImpl(webView);
   FrameLoader& loader = webViewImpl->mainFrameImpl()->frame()->loader();
   loader.setLoadType(FrameLoadTypeBackForward);
 
   webViewImpl->setPageScaleFactor(3.0f);
   webViewImpl->mainFrame()->setScrollOffset(WebSize(0, 500));
   loader.documentLoader()->initialScrollState().wasScrolledByUser = false;
   loader.currentItem()->setPageScaleFactor(2);
-  loader.currentItem()->setScrollPoint(WebPoint(0, 200));
+  loader.currentItem()->setScrollOffset(ScrollOffset(0, 200));
 
   // Flip back the wasScrolledByUser flag which was set to true by setPageScaleFactor
   // because otherwise FrameLoader::restoreScrollPositionAndViewState does nothing.
   loader.documentLoader()->initialScrollState().wasScrolledByUser = false;
   loader.restoreScrollPositionAndViewState();
 
   // Expect that both scroll and scale were restored.
   EXPECT_EQ(2.0f, webViewImpl->pageScaleFactor());
   EXPECT_EQ(200, webViewImpl->mainFrameImpl()->scrollOffset().height);
 }
 
 TEST_F(ProgrammaticScrollTest, RestoreScrollPositionAndViewStateWithoutScale) {
   registerMockedHttpURLLoad("long_scroll.html");
 
   FrameTestHelpers::WebViewHelper webViewHelper;
   WebView* webView = webViewHelper.initializeAndLoad(
       m_baseURL + "long_scroll.html", true, 0, 0);
   webView->resize(WebSize(1000, 1000));
   webView->updateAllLifecyclePhases();
 
   WebViewImpl* webViewImpl = toWebViewImpl(webView);
   FrameLoader& loader = webViewImpl->mainFrameImpl()->frame()->loader();
   loader.setLoadType(FrameLoadTypeBackForward);
 
   webViewImpl->setPageScaleFactor(3.0f);
   webViewImpl->mainFrame()->setScrollOffset(WebSize(0, 500));
   loader.documentLoader()->initialScrollState().wasScrolledByUser = false;
   loader.currentItem()->setPageScaleFactor(0);
-  loader.currentItem()->setScrollPoint(WebPoint(0, 400));
+  loader.currentItem()->setScrollOffset(ScrollOffset(0, 400));
 
   // FrameLoader::restoreScrollPositionAndViewState flows differently if scale is zero.
   loader.restoreScrollPositionAndViewState();
 
   // Expect that only the scroll position was restored.
   EXPECT_EQ(3.0f, webViewImpl->pageScaleFactor());
   EXPECT_EQ(400, webViewImpl->mainFrameImpl()->scrollOffset().height);
 }
 
 }  // namespace blink