Motown: Add new Ratio and LinearFunction classes to media/common/cpp.

services/media/common/BUILD.gn

Index: services/media/common/BUILD.gn
diff --git a/services/media/common/BUILD.gn b/services/media/common/BUILD.gn
index fb221485f4f50cb0888d6e32610d14ac0f9ada28..dc8e8b6d6d8098b78d0bfa36287e8f24973144d9 100644
--- a/services/media/common/BUILD.gn
+++ b/services/media/common/BUILD.gn
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//build/module_args/mojo.gni")
+import("//mojo/public/mojo_application.gni")
 import("$mojo_sdk_root/mojo/public/mojo_sdk.gni")
 
 source_set("common") {
@@ -18,3 +19,22 @@ source_set("common") {
     "//mojo/services/media/common/interfaces",
   ]
 }
+
+mojo_native_application("apptests") {
+  output_name = "media_common_apptests"
+
+  testonly = true
+
+  sources = [
+    "test/linear_function_test.cc",
+    "test/ratio_test.cc",
+    "test/test_base.h",
+  ]
+
+  deps = [
+    "//base",
+    "//mojo/application",
+    "//mojo/application:test_support",
+    "//mojo/services/media/common/cpp",
+  ]
+}