Begin tracking why layout is invalidated

Source/core/layout/LayoutFullScreen.cpp

 /*
  * Copyright (C) 2010 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 130 matching lines @@
             // Since we are moving the |object| to a new parent |fullscreenRenderer|,
             // the line box tree underneath our |containingBlock| is not longer valid.
             containingBlock->deleteLineBoxTree();
 
             parent->addChild(fullscreenRenderer, object);
             object->remove();
 
             // Always just do a full layout to ensure that line boxes get deleted properly.
             // Because objects moved from |parent| to |fullscreenRenderer|, we want to
             // make new line boxes instead of leaving the old ones around.
-            parent->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
-            containingBlock->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
+            parent->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
+            containingBlock->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
         }
         fullscreenRenderer->addChild(object);
-        fullscreenRenderer->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
+        fullscreenRenderer->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
     }
 
     ASSERT(document);
     Fullscreen::from(*document).setFullScreenRenderer(fullscreenRenderer);
     return fullscreenRenderer;
 }
 
 void LayoutFullScreen::unwrapRenderer()
 {
     // FIXME: We should not modify the structure of the render tree during
     // layout. crbug.com/370459
     DeprecatedDisableModifyRenderTreeStructureAsserts disabler;
 
     if (parent()) {
         for (LayoutObject* child = firstChild(); child; child = firstChild()) {
             // We have to clear the override size, because as a flexbox, we
             // may have set one on the child, and we don't want to leave that
             // lying around on the child.
             if (child->isBox())
                 toLayoutBox(child)->clearOverrideSize();
             child->remove();
             parent()->addChild(child, this);
-            parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
+            parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
         }
     }
     if (placeholder())
         placeholder()->remove();
     remove();
     destroy();
 }
 
 void LayoutFullScreen::setPlaceholder(LayoutBlock* placeholder)
 {
     m_placeholder = placeholder;
 }
 
 void LayoutFullScreen::createPlaceholder(PassRefPtr<LayoutStyle> style, const LayoutRect& frameRect)
 {
     if (style->width().isAuto())
         style->setWidth(Length(frameRect.width(), Fixed));
     if (style->height().isAuto())
         style->setHeight(Length(frameRect.height(), Fixed));
 
     if (!m_placeholder) {
         m_placeholder = new LayoutFullScreenPlaceholder(this);
         m_placeholder->setStyle(style);
         if (parent()) {
             parent()->addChild(m_placeholder, this);
-            parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
+            parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReason::Fullscreen);
         }
     } else {
         m_placeholder->setStyle(style);
     }
 }