Fix font-size shaking issue in some pages

third_party/WebKit/Source/core/layout/TextAutosizer.cpp

Index: third_party/WebKit/Source/core/layout/TextAutosizer.cpp
diff --git a/third_party/WebKit/Source/core/layout/TextAutosizer.cpp b/third_party/WebKit/Source/core/layout/TextAutosizer.cpp
index 0054e2b6da292016865d95e32b16c48f04640c0e..dc9f085bdb3360e127a8ec04a539ae80bc6ee74c 100644
--- a/third_party/WebKit/Source/core/layout/TextAutosizer.cpp
+++ b/third_party/WebKit/Source/core/layout/TextAutosizer.cpp
@@ -1009,6 +1009,11 @@ const LayoutBlock* TextAutosizer::DeepestBlockContainingAllText(
 // 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 && root->IsLayoutView())

[skobes, 2017/05/31 01:50:26]

I don't think we need to check if root is null here (if it were we would have
crashed inside FindTextLeaf).

[cathiechentx, 2017/06/01 15:36:27]

Done.

+    return root;
+
   size_t first_depth = 0;
   const LayoutObject* first_text_leaf = FindTextLeaf(root, first_depth, kFirst);
   if (!first_text_leaf)