Add VisualBenchTestActivity for instrumentation-testing VisualBench

platform_tools/android/apps/visualbench/src/main/java/com/skia/VisualBenchTestActivity.java

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+package com.skia;
+
+import android.app.Instrumentation;
+import android.content.Intent;
+import android.test.ActivityUnitTestCase;
+import android.util.Log;
+
+public class VisualBenchTestActivity extends ActivityUnitTestCase<VisualBenchActivity> {
+    private VisualBenchActivity mActivity;
+    private Instrumentation mInstrumentation;
+
+    public VisualBenchTestActivity() {
+        super(VisualBenchActivity.class);
+    }
+
+    protected void setUp() throws Exception {
+        super.setUp();
+        mInstrumentation = getInstrumentation();
+    }
+
+    public void testVisualBench() throws InterruptedException {
+        String pkg = getInstrumentation().getTargetContext().getPackageName();
+        Intent intent = new Intent(getInstrumentation().getTargetContext(),
+                                   VisualBenchActivity.class);
+        intent.putExtra("cmdLineFlags", "");
+        mActivity = launchActivityWithIntent(pkg, VisualBenchActivity.class, intent);
+
+        assertNotNull("mActivity is null", mActivity);
+        Thread.sleep(5000);
+        while (!mActivity.isDestroyed()) {
+            Log.d("skiatest", "Waiting for subprocess to finish.");
+            Thread.sleep(1000);
+        }
+    }
+}