Use float for scroll offset.

third_party/WebKit/Source/core/frame/DOMVisualViewport.h

 /*
  * Copyright (C) 2016 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 39 matching lines @@
   }
 
   ~DOMVisualViewport() override;
 
   DECLARE_VIRTUAL_TRACE();
 
   // EventTarget overrides:
   const AtomicString& interfaceName() const override;
   ExecutionContext* getExecutionContext() const override;
 
-  double scrollLeft();
-  double scrollTop();
-  double pageX();
-  double pageY();
+  float scrollLeft();

[bokan, 2016/10/02 19:47:50]

Perhaps we should have a ScrollUnit typedef?

[szager1, 2016/10/05 07:43:36]

I'll add the typedef, but I'm not going to try and replace all floats with
ScrollUnit in this patch.  This patch is big enough already.

+  float scrollTop();
+  float pageX();
+  float pageY();
   double clientWidth();
   double clientHeight();
   double scale();
 
  private:
   explicit DOMVisualViewport(LocalDOMWindow*);
 
   Member<LocalDOMWindow> m_window;
 };
 
 }  // namespace blink
 
 #endif  // DOMVisualViewport_h