Add viewer mode to VisualBench.

tools/VisualBench/VisualLightweightBenchModule.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 VisualLightweightBenchModule_DEFINED
 #define VisualLightweightBenchModule_DEFINED
@@ skipping 11 matching lines @@
 /*
  * This module is designed to be a minimal overhead timing module for VisualBench
  */
 class VisualLightweightBenchModule : public VisualModule {
 public:
     // TODO get rid of backpointer
     VisualLightweightBenchModule(VisualBench* owner);
 
     void draw(SkCanvas* canvas) override;
 
+    bool onHandleChar(SkUnichar c) override;
+
 private:
     /*
      * The heart of visual bench is an event driven timing loop.
      * kPreWarmLoopsPerCanvasPreDraw_State:  Before we begin timing, Benchmarks have a hook to
      *                                       access the canvas.  Then we prewarm before the autotune
      *                                       loops step.
      * kPreWarmLoops_State:                  We prewarm the gpu before auto tuning to enter a steady
      *                                       work state
      * kTuneLoops_State:                     Then we tune the loops of the benchmark to ensure we
      *                                       are doing a measurable amount of work
@@ skipping 47 matching lines @@
     SkAutoTUnref<Benchmark> fBenchmark;
 
     // support framework
     SkAutoTUnref<VisualBench> fOwner;
     SkAutoTDelete<ResultsWriter> fResults;
 
     typedef VisualModule INHERITED;
 };
 
 #endif