[Chromecast] Add support for z-order and window focus.

chromecast/graphics/BUILD.gn

 # Copyright 2015 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("//chromecast/chromecast.gni")
 import("//build/config/ui.gni")
+import("//testing/test.gni")
 
 source_set("graphics") {
   sources = [
     "cast_vsync_settings.cc",
     "cast_vsync_settings.h",
     "cast_window_manager.h",
   ]
 
   deps = [
     "//base",
     "//ui/gfx",
   ]
 
   if (use_aura && !is_cast_audio_only) {
     sources += [
+      "cast_focus_client_aura.cc",
+      "cast_focus_client_aura.h",
       "cast_window_manager_aura.cc",
       "cast_window_manager_aura.h",
     ]
 
     deps += [ "//ui/base/ime" ]
   } else {
     sources += [
       "cast_window_manager_default.cc",
       "cast_window_manager_default.h",
     ]
@@ skipping 25 matching lines @@
   public_deps = [
     "//chromecast/public",
   ]
 
   deps = [
     "//base",
     "//chromecast/base:chromecast_switches",
     "//chromecast/base:init_shlib",
   ]
 }
+
+test("cast_graphics_unittests") {
+  sources = [
+    "cast_focus_client_aura_test.cc",
+    "cast_window_manager_aura_test.cc",

[halliwell, 2017/01/24 00:54:46]

Do these need guarding (e.g. for Android builds)

[Joshua LeVasseur, 2017/01/24 03:39:50]

Done.

+    "run_all_unittests.cc",
+  ]
+  deps = [
+    ":graphics",
+    "//base/test:test_support",
+    "//testing/gtest",
+    "//ui/aura",
+    "//ui/aura:test_support",
+    "//ui/aura_extra",
+    "//ui/base:test_support",
+    "//ui/gfx",
+    "//ui/gl:test_support",
+  ]
+}