Added API to mirror display and added sample app.

Added the WMS.mirrorDisplay API to mirror a specified displayId. The
request requires the ACCESS_SURFACE_FLINGER permission.

Added a sample app to demonstrate the useablility of this API and
different ways the mirror SurfaceControl can be used.

Test: mmma tests/MirrorSurfaceTest and install apk
Bug: 131622422
Change-Id: Ic86115786d37473650b3c7ed39cba0bd4c65b281
diff --git a/tests/MirrorSurfaceTest/Android.bp b/tests/MirrorSurfaceTest/Android.bp
new file mode 100644
index 0000000..e359c64
--- /dev/null
+++ b/tests/MirrorSurfaceTest/Android.bp
@@ -0,0 +1,6 @@
+android_test {
+    name: "MirrorSurfaceTest",
+    srcs: ["src/**/*.java"],
+    platform_apis: true,
+    certificate: "platform",
+}