allow GMs to animate

samplecode/SampleCamera.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 "SampleCode.h"
 #include "SkView.h"
 #include "SkCanvas.h"
@@ skipping 68 matching lines @@
                 fFrontFace = frontFace;
                 fShaderIndex = (fShaderIndex + 1) % fShaders.count();
             }
 
             paint.setAntiAlias(true);
             paint.setShader(fShaders[fShaderIndex]);
             paint.setFilterLevel(SkPaint::kLow_FilterLevel);
             SkRect r = { -150, -150, 150, 150 };
             canvas->drawRoundRect(r, 30, 30, paint);
         }
+    }
 
-        fRY += SampleCode::GetAnimSecondsDelta() * 90;
-        if (fRY >= SkIntToScalar(360)) {
+    bool onAnimatePulse(SkMSec curr, SkMSec prev) SK_OVERRIDE {
+        fRY += (curr - prev) * 0.09f;
+        if (fRY >= 360) {
             fRY = 0;
         }
-        this->inval(NULL);
+        return true;
     }
 
 private:
     SkScalar fRX, fRY, fRZ;
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new CameraView; }
 static SkViewRegister reg(MyFactory);