Add viewer mode to VisualBench.

tools/VisualBench/VisualLightweightBenchModule.cpp

Index: tools/VisualBench/VisualLightweightBenchModule.cpp
diff --git a/tools/VisualBench/VisualLightweightBenchModule.cpp b/tools/VisualBench/VisualLightweightBenchModule.cpp
index 8f9e4881aa0a07cfd3b249f38448c701f88fc8bf..bc592a3934d564a18b29fdf6419f1dbc7622740c 100644
--- a/tools/VisualBench/VisualLightweightBenchModule.cpp
+++ b/tools/VisualBench/VisualLightweightBenchModule.cpp
@@ -127,7 +127,9 @@ bool VisualLightweightBenchModule::advanceRecordIfNecessary(SkCanvas* canvas) {
         return false;
     }
 
-    canvas->clear(0xffffffff);
+    fOwner->clear(canvas, SK_ColorWHITE, 2);
+
+
     fBenchmark->preDraw();
     fRecords.push_back();
 
@@ -254,3 +256,7 @@ inline void VisualLightweightBenchModule::timing(SkCanvas* canvas) {
         fCurrentFrame++;
     }
 }
+
+bool VisualLightweightBenchModule::onHandleChar(SkUnichar c) {
+    return true;
+}