Make the FloatSize constructor from an IntSize explicit.

third_party/WebKit/Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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.
@@ skipping 903 matching lines @@
 
     document->updateLayoutIgnorePendingStylesheets();
 
     Page* page = document->page();
 
     // Update initial viewport size.
     IntSize initialViewportSize(availableWidth, availableHeight);
     document->page()->deprecatedLocalMainFrame()->view()->setFrameRect(IntRect(IntPoint::zero(), initialViewportSize));
 
     ViewportDescription description = page->viewportDescription();
-    PageScaleConstraints constraints = description.resolve(initialViewportSize, Length());
+    PageScaleConstraints constraints = description.resolve(FloatSize(initialViewportSize), Length());
 
     constraints.fitToContentsWidth(constraints.layoutSize.width(), availableWidth);
     constraints.resolveAutoInitialScale();
 
     StringBuilder builder;
 
     builder.appendLiteral("viewport size ");
     builder.append(String::number(constraints.layoutSize.width()));
     builder.append('x');
     builder.append(String::number(constraints.layoutSize.height()));
@@ skipping 1634 matching lines @@
     mediaElement->setNetworkState(static_cast<WebMediaPlayer::NetworkState>(state));
 }
 
 // TODO(liberato): remove once autoplay gesture override experiment concludes.
 void Internals::triggerAutoplayViewportCheck(HTMLMediaElement* element)
 {
     element->triggerAutoplayViewportCheckForTesting();
 }
 
 } // namespace blink