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 109 matching lines @@
 bool VisualLightweightBenchModule::advanceRecordIfNecessary(SkCanvas* canvas) {
     if (fBenchmark) {
         return true;
     }
 
     fBenchmark.reset(fBenchmarkStream->next());
     if (!fBenchmark) {
         return false;
     }
 
-    canvas->clear(0xffffffff);
+    fOwner->clear(canvas, SK_ColorWHITE, 2);
+
+
     fBenchmark->preDraw();
     fRecords.push_back();
 
     // Log bench name
     fResults->bench(fBenchmark->getUniqueName(), fBenchmark->getSize().fX,
                     fBenchmark->getSize().fY);
     return true;
 }
 
 inline void VisualLightweightBenchModule::nextState(State nextState) {
@@ skipping 106 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;
+}