Add samples to Viewer.

samplecode/SampleClock.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SampleCode.h"
 
 #include "SkCanvas.h"
 #include "SkPath.h"
@@ skipping 197 matching lines @@
         path.reset();
         path.arcTo(rect, 0, 0, false);
         path.addOval(rect, SkPath::kCCW_Direction);
         path.arcTo(rect, 360, 0, true);
         canvas->drawPath(path, paintStroke);
 #else
         canvas->drawOval(rect, paintStroke);
 #endif
 
         canvas->restore();
+    }
 
-        this->inval(nullptr);
+    bool onAnimate(const SkAnimTimer&) override {
+        return true;
     }
 
 private:
 
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new ClockView; }
 static SkViewRegister reg(MyFactory);