Don't overflow in LayoutText::width() on a huge length.

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/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/bindings/modules/v8/generated.gni")
@@ skipping 1124 matching lines @@
     "layout/LayoutInlineTest.cpp",
     "layout/LayoutMultiColumnFlowThreadTest.cpp",
     "layout/LayoutObjectTest.cpp",
     "layout/LayoutPartTest.cpp",
     "layout/LayoutProgressTest.cpp",
     "layout/LayoutTableCellTest.cpp",
     "layout/LayoutTableRowTest.cpp",
     "layout/LayoutTableSectionTest.cpp",
     "layout/LayoutTestHelper.cpp",
     "layout/LayoutTestHelper.h",
+    "layout/LayoutTextTest.cpp",
     "layout/LayoutThemeTest.cpp",
     "layout/MapCoordinatesTest.cpp",
     "layout/MultiColumnFragmentainerGroupTest.cpp",
     "layout/OverflowModelTest.cpp",
     "layout/PaginationTest.cpp",
     "layout/PaintContainmentTest.cpp",
     "layout/ScrollAnchorTest.cpp",
     "layout/TextAutosizerTest.cpp",
     "layout/VisualRectMappingTest.cpp",
     "layout/compositing/CompositedLayerMappingTest.cpp",
@@ skipping 84 matching lines @@
   sources = [
     "html/parser/HTMLPreloadScannerFuzzer.cpp",
     "html/parser/TextResourceDecoderForFuzzing.h",
   ]
   seed_corpus = "//third_party/WebKit/LayoutTests/fast/parser"
   deps = [
     ":core",
     "../platform:blink_fuzzer_test_support",
   ]
 }