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

mojo/services/media/common/cpp/BUILD.gn

Index: mojo/services/media/common/cpp/BUILD.gn
diff --git a/mojo/services/media/common/cpp/BUILD.gn b/mojo/services/media/common/cpp/BUILD.gn
index 627a7267b1040381657479fb101ca23ee65363d0..e46af00f32e0677484eedfcdbba91f629f776166 100644
--- a/mojo/services/media/common/cpp/BUILD.gn
+++ b/mojo/services/media/common/cpp/BUILD.gn
@@ -12,11 +12,15 @@ mojo_sdk_source_set("cpp") {
     "circular_buffer_media_pipe_adapter.h",
     "fifo_allocator.cc",
     "fifo_allocator.h",
+    "linear_function.cc",
+    "linear_function.h",
     "linear_transform.cc",
     "linear_transform.h",
     "local_time.h",
     "mapped_shared_buffer.cc",
     "mapped_shared_buffer.h",
+    "ratio.cc",
+    "ratio.h",
     "shared_media_buffer_allocator.cc",
     "shared_media_buffer_allocator.h",
   ]
@@ -36,3 +40,5 @@ mojo_sdk_source_set("cpp") {
     "$mojo_sdk_root/mojo/services/media/common/interfaces",
   ]
 }
+# Look for unit tests in services/media/common/test
+# TODO(dalesat): Move unit tests here using different test infrastructure.