Add VisualBenchTestActivity for instrumentation-testing VisualBench

platform_tools/android/apps/visualbench/src/main/java/com/skia/VisualBenchActivity.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.Activity;
-import android.content.Intent;
 import android.os.Bundle;
 import android.provider.Settings;
-import android.util.Log;
 import android.view.View;
 import android.view.WindowManager;
 
 public class VisualBenchActivity extends android.app.NativeActivity {
     static {
         System.loadLibrary("skia_android");
     }
     
     @Override
     public void onCreate(Bundle savedInstanceState) 
@@ skipping 15 matching lines @@
         // Disable backlight to keep the system as cool as possible
         // TODO make this configurable
         Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_BRIGHTNESS_MODE,
                                                      Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
         
         WindowManager.LayoutParams lp = getWindow().getAttributes();
         lp.screenBrightness = 0; // 0f - no backlight
         getWindow().setAttributes(lp);
     }
 }