add SkAnimTimer, SPACE = pause/resume, ESP = stop

gm/addarc.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
+#include "SkAnimTimer.h"
 #include "SkCanvas.h"
 #include "SkRandom.h"
 
 class AddArcGM : public skiagm::GM {
 public:
     AddArcGM() : fRotate(0) {}
 
 protected:
     SkString onShortName() SK_OVERRIDE { return SkString("addarc"); }
 
@@ skipping 23 matching lines @@
 
             SkPath path;
             path.addArc(r, startAngle, sweepAngle);
             canvas->drawPath(path, paint);
 
             r.inset(inset, inset);
             sign = -sign;
         }
     }
 
-    bool onAnimatePulse(SkMSec curr, SkMSec prev) SK_OVERRIDE {
-        fRotate = SkDoubleToScalar(fmod(curr * 0.001, 360));
+    bool onAnimate(const SkAnimTimer& timer) SK_OVERRIDE {
+        fRotate = timer.scaled(1, 360);
         return true;
     }
 
 private:
     SkScalar fRotate;
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new AddArcGM; )