add autotuning to visualbench

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
@@ skipping 36 matching lines @@
     bool loadPicture();
     bool advanceRecordIfNecessary();
     inline void renderFrame(SkCanvas*);
 
     struct Record {
         SkString fFilename;
         SkTArray<double> fMeasurements;
     };
 
     enum State {
-        kPreWarm_State,
+        kPreWarmLoops_State,
+        kTuneLoops_State,
+        kPreWarmTiming_State,
         kTiming_State,
     };
+    void preWarm(State nextState);
 
-    int fLoop;
     int fCurrentPictureIdx;
     SkAutoTUnref<SkPicture> fPicture;
     int fCurrentSample;
+    int fCurrentFrame;
+    int fFlushes;
+    int fLoops;
     SkTArray<Record> fRecords;
     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