Fix font-size shaking issue in some pages

third_party/WebKit/Source/core/layout/TextAutosizer.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 991 matching lines @@
   if (!cluster->deepest_block_containing_all_text_)
     cluster->deepest_block_containing_all_text_ =
         DeepestBlockContainingAllText(cluster->root_);
 
   return cluster->deepest_block_containing_all_text_;
 }
 
 // FIXME: Refactor this to look more like TextAutosizer::deepestCommonAncestor.
 const LayoutBlock* TextAutosizer::DeepestBlockContainingAllText(
     const LayoutBlock* root) const {
+  // To avoid font-size shaking caused by the change of LayoutView's
+  // DeepestBlockContainingAllText.
+  if (root->IsLayoutView())
+    return root;
+
   size_t first_depth = 0;
   const LayoutObject* first_text_leaf = FindTextLeaf(root, first_depth, kFirst);
   if (!first_text_leaf)
     return root;
 
   size_t last_depth = 0;
   const LayoutObject* last_text_leaf = FindTextLeaf(root, last_depth, kLast);
   DCHECK(last_text_leaf);
 
   // Equalize the depths if necessary. Only one of the while loops below will
@@ skipping 366 matching lines @@
     }
   }
   potentially_inconsistent_superclusters.clear();
 }
 
 DEFINE_TRACE(TextAutosizer) {
   visitor->Trace(document_);
 }
 
 }  // namespace blink