Temporarily add CHECKs to VisualViewport::didSetScaleAndLocation

third_party/WebKit/Source/core/frame/VisualViewport.cpp

 /*
  * Copyright (C) 2013 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 232 matching lines @@
     notifyRootFrameViewport();
 }
 
 bool VisualViewport::didSetScaleOrLocation(float scale,
                                            const FloatPoint& location) {
   if (!mainFrame())
     return false;
 
   bool valuesChanged = false;
 
+  CHECK(!std::isnan(scale));
+  CHECK(std::isfinite(scale));
   if (scale != m_scale) {
     m_scale = scale;
     valuesChanged = true;
     page().chromeClient().pageScaleFactorChanged();
     enqueueResizeEvent();
   }
 
   ScrollOffset clampedOffset = clampScrollOffset(toScrollOffset(location));
 
+  CHECK(!std::isnan(clampedOffset.width()) &&
+        !std::isnan(clampedOffset.height()));
+  CHECK(std::isfinite(clampedOffset.width()) &&
+        std::isfinite(clampedOffset.height()));
   if (clampedOffset != m_offset) {
     m_offset = clampedOffset;
     scrollAnimator().setCurrentOffset(m_offset);
 
     // SVG runs with accelerated compositing disabled so no
     // ScrollingCoordinator.
     if (ScrollingCoordinator* coordinator = page().scrollingCoordinator())
       coordinator->scrollableAreaScrollLayerDidChange(this);
 
     if (!page().settings().getInertVisualViewport()) {
@@ skipping 559 matching lines @@
   } else if (graphicsLayer == m_rootTransformLayer.get()) {
     name = "Root Transform Layer";
   } else {
     ASSERT_NOT_REACHED();
   }
 
   return name;
 }
 
 }  // namespace blink