[layoutng] async layout part 1: Change the API to support async

third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm_test.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/ng/ng_block_layout_algorithm.h"
 
 #include "core/layout/ng/ng_box_iterator.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_fragment.h"
 #include "core/layout/ng/ng_length_utils.h"
@@ skipping 11 matching lines @@
 };
 
 TEST_F(NGBlockLayoutAlgorithmTest, FixedSize) {
   style_->setWidth(Length(30, Fixed));
   style_->setHeight(Length(40, Fixed));
 
   NGConstraintSpace* space = new NGConstraintSpace(
       HorizontalTopBottom, NGLogicalSize(LayoutUnit(100), NGSizeIndefinite));
 
   NGBlockLayoutAlgorithm algorithm(style_, NGBoxIterator(NGBox()));
-  NGFragment* frag = algorithm.layout(space);
+  NGFragment* frag;
+  while (!algorithm.Layout(space, &frag))
+    ;
   EXPECT_EQ(frag->InlineSize(), LayoutUnit(30));
   EXPECT_EQ(frag->BlockSize(), LayoutUnit(40));
 }
 
 }  // namespace
 }  // namespace blink