[LayoutNG] Introduce block child iterator.

third_party/WebKit/Source/core/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chromecast_build.gni")
 import("//build/toolchain/toolchain.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
@@ skipping 1277 matching lines @@
     "layout/PaginationTest.cpp",
     "layout/PaintContainmentTest.cpp",
     "layout/ScrollAnchorTest.cpp",
     "layout/TextAutosizerTest.cpp",
     "layout/VisualRectMappingTest.cpp",
     "layout/compositing/CompositedLayerMappingTest.cpp",
     "layout/compositing/CompositingReasonFinderTest.cpp",
     "layout/line/InlineBoxTest.cpp",
     "layout/line/InlineTextBoxTest.cpp",
     "layout/ng/ng_absolute_utils_test.cc",
+    "layout/ng/ng_block_child_iterator_test.cc",
     "layout/ng/ng_block_layout_algorithm_test.cc",
     "layout/ng/ng_block_node_test.cc",
     "layout/ng/ng_constraint_space_builder_test.cc",
     "layout/ng/ng_constraint_space_test.cc",
     "layout/ng/ng_inline_node_test.cc",
     "layout/ng/ng_layout_inline_items_builder_test.cc",
     "layout/ng/ng_length_utils_test.cc",
     "layout/ng/ng_out_of_flow_layout_part_test.cc",
     "layout/ng/ng_units_test.cc",
     "layout/shapes/BoxShapeTest.cpp",
@@ skipping 115 matching lines @@
   sources = [
     "frame/csp/ContentSecurityPolicyFuzzer.cpp",
   ]
   deps = [
     ":core",
     "//third_party/WebKit/Source/platform:blink_fuzzer_test_support",
   ]
   dict = "//testing/libfuzzer/fuzzers/dicts/content_security_policy.dict"
   seed_corpus = "//testing/libfuzzer/fuzzers/content_security_policy_corpus"
 }