Change to add zoom animations to nanobench

bench/SKPAnimationBench.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 SKPAnimationBench_DEFINED
+#define SKPAnimationBench_DEFINED
+
+#include "SKPBench.h"
+
+/**
+ * Runs an SkPicture as a benchmark by repeatedly drawing it, first centering the picture and
+ * for each step it concats the passed in matrix
+ */
+class SKPAnimationBench : public SKPBench {
+public:
+    SKPAnimationBench(const char* name, const SkPicture*, const SkIRect& devClip,
+                      SkMatrix viewMatrix, int steps);
+
+protected:
+    const char* onGetName() override;
+    const char* onGetUniqueName() override;
+    void onPerCanvasPreDraw(SkCanvas* canvas) override;
+
+    void drawMPDPicture() override {
+        SkFAIL("MPD not supported\n");

[bsalomon, 2015/04/27 14:31:43]

Won't this cause you to crash in a run that has the default mpd flag?

Maybe we should just go ahead and implement it.

[joshualitt, 2015/04/27 15:29:50]

Its your call.  Its currently never called because I have hardcoded useMpd =
false in the call to construct the base class.

+    }
+    void drawPicture() override;
+
+private:
+    int fSteps;
+    SkMatrix fAnimationMatrix;
+    SkString fName;
+    SkString fUniqueName;
+    SkPoint fCenter;
+
+    typedef SKPBench INHERITED;
+};
+
+#endif