Remove SkBenchmark::postDraw.

bench/SkBenchmark.h

Index: bench/SkBenchmark.h
diff --git a/bench/SkBenchmark.h b/bench/SkBenchmark.h
index 00a816cdba76ca08316b378976023e0adf582662..e86c81b8ec5cdd44824e983d3e0f7690f2dc6627 100644
--- a/bench/SkBenchmark.h
+++ b/bench/SkBenchmark.h
@@ -72,11 +72,6 @@ public:
     // Bench framework can tune loops to be large enough for stable timing.
     void draw(const int loops, SkCanvas*);
 
-    // Call after draw, allows the benchmark to do cleanup work outside of the
-    // timer. When a benchmark is repeatedly drawn, this is only called once
-    // after the last draw.
-    void postDraw();
-
     void setForceAlpha(int alpha) {
         fForceAlpha = alpha;
     }
@@ -118,7 +113,6 @@ protected:
     // Each bench should do its main work in a loop like this:
     //   for (int i = 0; i < loops; i++) { <work here> }
     virtual void onDraw(const int loops, SkCanvas*) = 0;
-    virtual void onPostDraw() {}
 
     virtual SkIPoint onGetSize();