evaluating clipboard event target acording to w3c specification

third_party/WebKit/Source/core/editing/BUILD.gn

 # 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.
 
 import("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("editing") {
   split_count = 5
   sources = [
     "CaretDisplayItemClient.cpp",
@@ skipping 200 matching lines @@
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
+    "ClipboardEventFlowTest.cpp",
     "CompositionUnderlineTest.cpp",
     "EditingCommandTest.cpp",
     "EditingStrategyTest.cpp",
     "EditingStyleTest.cpp",
     "EditingTestBase.cpp",
     "EditingTestBase.h",
     "EditingUtilitiesTest.cpp",
     "EditorTest.cpp",
     "EphemeralRangeTest.cpp",
     "FrameSelectionTest.cpp",
@@ skipping 37 matching lines @@
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/Source/core:core",
   ]
 }