Use float for scroll offset.

third_party/WebKit/Source/web/RotationViewportAnchor.cpp

Index: third_party/WebKit/Source/web/RotationViewportAnchor.cpp
diff --git a/third_party/WebKit/Source/web/RotationViewportAnchor.cpp b/third_party/WebKit/Source/web/RotationViewportAnchor.cpp
index 11c0c801fdd6bd7da035a40a7ec70ca5fb1d55b1..c161f6bb39fb3731ddc98e5e5f9b12b9a6f80adc 100644
--- a/third_party/WebKit/Source/web/RotationViewportAnchor.cpp
+++ b/third_party/WebKit/Source/web/RotationViewportAnchor.cpp
@@ -107,8 +107,7 @@ void RotationViewportAnchor::setAnchor() {
 
   IntRect outerViewRect =
       layoutViewport().visibleContentRect(IncludeScrollbars);
-  IntRect innerViewRect =
-      enclosedIntRect(rootFrameViewport->visibleContentRectDouble());
+  IntRect innerViewRect = rootFrameViewport->visibleContentRect();
 
   m_oldPageScaleFactor = m_visualViewport->scale();
   m_oldMinimumPageScaleFactor =
@@ -116,7 +115,7 @@ void RotationViewportAnchor::setAnchor() {
 
   // Save the absolute location in case we won't find the anchor node, we'll fall back to that.
   m_visualViewportInDocument =
-      FloatPoint(rootFrameViewport->visibleContentRectDouble().location());
+      FloatPoint(rootFrameViewport->visibleContentRect().location());
 
   m_anchorNode.clear();
   m_anchorNodeBounds = LayoutRect();
@@ -180,7 +179,8 @@ void RotationViewportAnchor::restoreToAnchor() {
 
   computeOrigins(visualViewportSize, mainFrameOrigin, visualViewportOrigin);
 
-  layoutViewport().setScrollPosition(mainFrameOrigin, ProgrammaticScroll);
+  layoutViewport().setScrollOffset(toScrollOffset(mainFrameOrigin),
+                                   ProgrammaticScroll);
 
   // Set scale before location, since location can be clamped on setting scale.
   m_visualViewport->setScale(newPageScaleFactor);
@@ -212,8 +212,8 @@ void RotationViewportAnchor::computeOrigins(
 
   moveToEncloseRect(outerRect, innerRect);
 
-  outerRect.setLocation(
-      layoutViewport().clampScrollPosition(outerRect.location()));
+  outerRect.setLocation(IntPoint(
+      layoutViewport().clampScrollOffset(toIntSize(outerRect.location()))));
 
   moveIntoRect(innerRect, outerRect);