arc-app-launcher: Minimal support for ARC app launcher.

components/arc/BUILD.gn

Index: components/arc/BUILD.gn
diff --git a/components/arc/BUILD.gn b/components/arc/BUILD.gn
index e6d6cae938cabf6184600255ae01f581ec0af6d2..3137136e83ef0237b87eb190c201e3d8ec5a46de 100644
--- a/components/arc/BUILD.gn
+++ b/components/arc/BUILD.gn
@@ -6,6 +6,8 @@ static_library("arc") {
   sources = [
     "arc_bridge_service.cc",
     "arc_bridge_service.h",
+    "arc_bridge_service_impl.cc",
+    "arc_bridge_service_impl.h",
     "common/arc_message_generator.cc",
   ]
 
@@ -16,6 +18,21 @@ static_library("arc") {
   ]
 }
 
+static_library("test_support") {
+  testonly = true
+  sources = [
+    "test/fake_arc_bridge_service.cc",
+    "test/fake_arc_bridge_service.h",
+  ]
+
+  deps = [
+    ":arc",
+    "//chrome/browser/ui",
+    "//ui/app_list",
+    "//ui/gfx",
+  ]
+}
+
 source_set("unit_tests") {
   testonly = true
   sources = [