Add Dashing gpu effect for simple dashed lines

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 "SkData.h"
 #include "SkCanvas.h"
@@ skipping 60 matching lines @@
 #ifdef  PIPE_FILE
 #define FILE_PATH "/path/to/drawing.data"
 #endif
 
 #define PIPE_NETx
 #ifdef  PIPE_NET
 #include "SkSockets.h"
 SkTCPServer gServer;
 #endif
 
-#define USE_ARROWS_FOR_ZOOM false
+#define USE_ARROWS_FOR_ZOOM true
 
 #if SK_ANGLE
 //#define DEFAULT_TO_ANGLE 1
 #else
 #define DEFAULT_TO_GPU 0 // if 1 default rendering is on GPU
 #endif
 
 #define ANIMATING_EVENTTYPE "nextSample"
 #define ANIMATING_DELAY     250
 
@@ skipping 2466 matching lines @@
     SkGraphics::Init();
     SkEvent::Init();
 }
 
 // FIXME: this should be in a header
 void application_term();
 void application_term() {
     SkEvent::Term();
     SkGraphics::Term();
 }