Get event targetting working for mouse events.

mojo/services/window_manager/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")
 
 # GYP version: mojo/mojo_services.gypi:mojo_core_window_manager
 shared_library("window_manager") {
   sources = [ "main.cc" ]
 
@@ skipping 44 matching lines @@
     "//mojo/services/public/cpp/view_manager",
     "//mojo/public/interfaces/application:application",
     "//mojo/services/public/interfaces/native_viewport",
     "//mojo/services/public/interfaces/window_manager",
   ]
 }
 
 # GYP version: mojo/mojo_services.gypi:mojo_core_window_manager_unittests
 test("window_manager_unittests") {
   sources = [
+    "view_target_unittest.cc",
+    "view_targeter_unittest.cc",
     "window_manager_api_unittest.cc",
+    "window_manager_test_util.cc",
+    "window_manager_test_util.h",
     "window_manager_unittests.cc",
   ]
 
+  public_deps = [
+    ":lib",
+  ]
+
   deps = [
     "//base/test:test_support",
     "//mojo/application_manager",
     "//mojo/edk/system",
     "//mojo/environment:chromium",
     "//mojo/services/public/cpp/view_manager",
     "//mojo/services/public/interfaces/view_manager",
     "//mojo/services/public/interfaces/window_manager",
     "//mojo/shell:test_support",
     "//testing/gtest",
+    "//ui/events:test_support",
+    "//ui/gfx",
+    "//ui/gfx:test_support",
     "//ui/gl",
   ]
 
   if (use_x11) {
     deps += [ "//ui/gfx/x" ]
   }
 }