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

chromecast/public/graphics_types.h

+// 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_GRAPHICS_TYPES_H_
+#define CHROMECAST_PUBLIC_GRAPHICS_TYPES_H_
+
+namespace chromecast {
+
+struct Rect {
+  Rect(int w, int h) : x(0), y(0), width(w), height(h) {}
+  Rect(int arg_x, int arg_y, int w, int h)
+      : x(arg_x), y(arg_y), width(w), height(h) {}
+
+  int x;
+  int y;
+  int width;
+  int height;
+};
+
+struct Size {
+  Size(int w, int h) : width(w), height(h) {}
+
+  int width;
+  int height;
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_PUBLIC_GRAPHICS_TYPES_H_