Avoid synchronous stylesheet update on html import loaded.

third_party/WebKit/Source/web/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/ui.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//third_party/WebKit/Source/modules/modules.gni")
@@ skipping 287 matching lines @@
     "tests/DeferredLoadingTest.cpp",
     "tests/DocumentLoaderTest.cpp",
     "tests/DocumentLoadingRenderingTest.cpp",
     "tests/FakeWebPlugin.cpp",
     "tests/FakeWebPlugin.h",
     "tests/FrameSerializerTest.cpp",
     "tests/FrameTestHelpers.cpp",
     "tests/FrameTestHelpers.h",
     "tests/FrameThrottlingTest.cpp",
     "tests/HTMLDocumentParserLoadingTest.cpp",
+    "tests/HTMLImportSheetsTest.cpp",
     "tests/ImeOnFocusTest.cpp",
     "tests/IntersectionObserverTest.cpp",
     "tests/KeyboardTest.cpp",
     "tests/LayoutGeometryMapTest.cpp",
     "tests/LinkElementLoadingTest.cpp",
     "tests/LinkSelectionTest.cpp",
     "tests/ListenerLeakTest.cpp",
     "tests/LocalFrameClientImplTest.cpp",
     "tests/MHTMLTest.cpp",
     "tests/MediaElementFillingViewportTest.cpp",
@@ skipping 91 matching lines @@
 
   if (is_android) {
     deps += [
       "//base:base_java",
       "//content/public/android:content_java",
       "//content/shell/android:content_shell_assets",
       "//net/android:net_java",
     ]
   }
 }