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

chromecast/graphics/BUILD.gn

Index: chromecast/graphics/BUILD.gn
diff --git a/chromecast/graphics/BUILD.gn b/chromecast/graphics/BUILD.gn
index 8fd33dec9203adfcc394098c7b62ea87ee276afc..e2774693533b71fd37f9e85fb2e93b1542686f47 100644
--- a/chromecast/graphics/BUILD.gn
+++ b/chromecast/graphics/BUILD.gn
@@ -4,6 +4,7 @@
 
 import("//chromecast/chromecast.gni")
 import("//build/config/ui.gni")
+import("//testing/test.gni")
 
 source_set("graphics") {
   sources = [
@@ -19,6 +20,8 @@ source_set("graphics") {
 
   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",
     ]
@@ -64,3 +67,22 @@ shared_library("libcast_graphics_1.0") {
     "//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",
+  ]
+}