add sample to exercise hittesting

samplecode/SampleApp.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleApp.h"
 
 #include "OverView.h"
@@ skipping 801 matching lines @@
         SkString title;
         if (readTitleFromPrefs(&title)) {
             fCurrIndex = findByTitle(title.c_str());
         }
     }
 
     if (fCurrIndex < 0) {
         fCurrIndex = 0;
     }
 
-    static SkTaskGroup::Enabler enabled(-1);
+    static SkTaskGroup::Enabler enabled(0);
     gSampleWindow = this;
 
 #ifdef  PIPE_FILE
     //Clear existing file or create file if it doesn't exist
     FILE* f = fopen(FILE_PATH, "wb");
     fclose(f);
 #endif
 
     fDeviceType = kRaster_DeviceType;
 
@@ skipping 1600 matching lines @@
     setenv("ANDROID_ROOT", "/android/device/data", 0);
 #endif
     SkGraphics::Init();
     SkEvent::Init();
 }
 
 void application_term() {
     SkEvent::Term();
     SkGraphics::Term();
 }