Add viewer mode to VisualBench.

tools/VisualBench/VisualLightweightBenchModule.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  */
 
 #include "VisualLightweightBenchModule.h"
 
@@ skipping 236 matching lines @@
             this->postDraw(canvas);
             this->nextState(kPreWarmLoopsPerCanvasPreDraw_State);
         } else {
             this->nextState(kPreWarmTimingPerCanvasPreDraw_State);
         }
         this->resetTimingState();
     } else {
         fCurrentFrame++;
     }
 }
+
+bool VisualLightweightBenchModule::onHandleChar(SkUnichar c) {
+    return true;
+}