Force events to be non blocking if main thread is unresponsive.

third_party/WebKit/Source/platform/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/features.gni")
 import("//build/config/ui.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
@@ skipping 1440 matching lines @@
     "//third_party/libpng",
     "//third_party/libwebp",
     "//third_party/ots",
     "//url",
     "//v8",
   ]
   deps = [
     ":blink_common",
     "//components/link_header_util:link_header_util",
     "//components/mime_util:mime_util",
+    "//device/base/synchronization",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/bindings:wtf_support",
     "//third_party/WebKit/Source/platform/heap",
     "//third_party/WebKit/public:mojo_bindings_blink",
     "//third_party/WebKit/public:offscreen_canvas_mojo_bindings_blink",
     "//third_party/ced",
     "//third_party/harfbuzz-ng",
     "//third_party/icu",
     "//ui/gfx",
     "//ui/gfx/geometry",
@@ skipping 372 matching lines @@
 
   deps = [
     ":blink_common",
     ":platform",
     ":test_support",
     "//base",
     "//base/test:test_support",
     "//cc",
     "//cc:test_support",
     "//cc/blink",
+    "//device/base/synchronization",
     "//mojo/common:test_common_custom_types_blink",
     "//mojo/edk/embedder:headers",
     "//mojo/edk/test:test_support",
     "//mojo/public/cpp/bindings/tests:for_blink_tests",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/Source/wtf",
     "//third_party/harfbuzz-ng",
     "//ui/gfx",
@@ skipping 207 matching lines @@
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     ":test_support",
     "//cc/surfaces:surface_id",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }