Use float for scroll offset.

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

 /*
  * Copyright (C) 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 192 matching lines @@
   ASSERT_TRUE(layoutObject->isBox());
   LayoutBox* box = toLayoutBox(layoutObject);
   ASSERT_TRUE(box->usesCompositedScrolling());
   CompositedLayerMapping* compositedLayerMapping =
       box->layer()->compositedLayerMapping();
   ASSERT_TRUE(compositedLayerMapping->hasScrollingLayer());
   DCHECK(compositedLayerMapping->scrollingContentsLayer());
   WebLayer* webScrollLayer =
       compositedLayerMapping->scrollingContentsLayer()->platformLayer();
   ASSERT_TRUE(webScrollLayer);
-  ASSERT_NEAR(1.2, webScrollLayer->scrollPositionDouble().x, 0.01);
-  ASSERT_NEAR(1.2, webScrollLayer->scrollPositionDouble().y, 0.01);
+  ASSERT_NEAR(1.2f, webScrollLayer->scrollPositionDouble().x, 0.01f);
+  ASSERT_NEAR(1.2f, webScrollLayer->scrollPositionDouble().y, 0.01f);
 
   RuntimeEnabledFeatures::setFractionalScrollOffsetsEnabled(
       origFractionalOffsetsEnabled);
 }
 
 static WebLayer* webLayerFromElement(Element* element) {
   if (!element)
     return 0;
   LayoutObject* layoutObject = element->layoutObject();
   if (!layoutObject || !layoutObject->isBoxModelObject())
@@ skipping 510 matching lines @@
   forceFullCompositingUpdate();
   scrollbarGraphicsLayer = compositedLayerMapping->layerForVerticalScrollbar();
   ASSERT_FALSE(
       scrollbarGraphicsLayer->platformLayer()->shouldScrollOnMainThread());
   ASSERT_FALSE(
       scrollbarGraphicsLayer->platformLayer()->mainThreadScrollingReasons() &
       MainThreadScrollingReason::kCustomScrollbarScrolling);
 }
 
 }  // namespace blink