Adds public API and loads Cast OSD plane implementation from shared lib

chromecast/public/size.h

Index: chromecast/public/size.h
diff --git a/chromecast/public/size.h b/chromecast/public/size.h
new file mode 100644
index 0000000000000000000000000000000000000000..caa695ea427fbda09eea94383d8edfda78dc9e94
--- /dev/null
+++ b/chromecast/public/size.h
@@ -0,0 +1,18 @@
+// Copyright (c) 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.
+
+#ifndef CHROMECAST_PUBLIC_SIZE_H_
+#define CHROMECAST_PUBLIC_SIZE_H_
+
+namespace chromecast {
+
+struct Size {
+  Size(int w, int h) : width(w), height(h) {}
+  int width;
+  int height;
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_PUBLIC_SIZE_H