Expand VisualBench to a real benching tool

tools/VisualBench.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  */
 
 #ifndef VisualBench_DEFINED
 #define VisualBench_DEFINED
 
 #include "SkWindow.h"
 
 #include "SkPicture.h"
 #include "SkSurface.h"
+#include "Timer.h"
 #include "gl/SkGLContext.h"
 
 class GrContext;
 struct GrGLInterface;
 class GrRenderTarget;
 class SkCanvas;
 
 /*
  * A Visual benchmarking tool for gpu benchmarking
  */
 class VisualBench : public SkOSWindow {
 public:
     VisualBench(void* hwnd, int argc, char** argv);
     ~VisualBench() override;
 
 protected:
     SkSurface* createSurface() override;
 
     void draw(SkCanvas* canvas) override;
 
     void onSizeChange() override;
 
 private:
     void setTitle();
     bool setupBackend();
+    void resetContext();
     void setupRenderTarget();
     bool onHandleChar(SkUnichar unichar) override;
+    void timeFrame(SkCanvas*);
+    void printStats();
+    inline void timePicture(SkCanvas*);
+    inline void renderFrame(SkCanvas*);
 
-    int fCurrentLoops;
+    struct Timing {
+        SkString fName;
+        SkTArray<double> fMeasurements;
+    };
+
+    enum State {
+        kPreWarm_State,
+        kTiming_State,
+    };
+
+    int fLoop;
     int fCurrentPicture;
-    int fCurrentFrame;
+    int fCurrentSample;
+    SkTArray<Timing> fTimings;
     SkTArray<SkPicture*> fPictures;
+    WallTimer fTimer;
+    State fState;
 
     // support framework
     SkAutoTUnref<SkSurface> fSurface;
     SkAutoTUnref<GrContext> fContext;
     SkAutoTUnref<GrRenderTarget> fRenderTarget;
     AttachmentInfo fAttachmentInfo;
     SkAutoTUnref<const GrGLInterface> fInterface;
 
     typedef SkOSWindow INHERITED;
 };
 
 #endif