More accurate render time and continuous fresh

tools/viewer/Viewer.h

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #ifndef Viewer_DEFINED
 #define Viewer_DEFINED
 
@@ skipping 34 matching lines @@
 
     static const int kMeasurementCount = 64;  // should be power of 2 for fast mod
     double fMeasurements[kMeasurementCount];
     int fCurrentMeasurement;
 
     SkAnimTimer            fAnimTimer;
     SkTArray<sk_sp<Slide>> fSlides;
     int                    fCurrentSlide;
 
     bool                   fDisplayStats;
+    bool                   fRefresh; // whether to continuously refresh for measuring render time
 
     // whether to split the screen and draw two copies of the slide, one with sRGB and one without
     bool                   fSplitScreen;
 
     sk_app::Window::BackendType fBackendType;
 
     // transform data
     SkScalar               fZoomCenterX;
     SkScalar               fZoomCenterY;
     SkScalar               fZoomLevel;
     SkScalar               fZoomScale;
 
     sk_app::CommandSet     fCommands;
 
     SkTouchGesture         fGesture;
 
     // identity unless the window initially scales the content to fit the screen.
     SkMatrix               fDefaultMatrix;
     SkMatrix               fDefaultMatrixInv;
 
     Json::Value            fAllSlideNames; // cache all slide names for fast updateUIState
 };
 
 
 #endif