Added --deepColor option to SampleApp, triggers creation of a ten-bit/channel buffer on Windows.

tools/VisualBench/VisualBench.cpp

Index: tools/VisualBench/VisualBench.cpp
diff --git a/tools/VisualBench/VisualBench.cpp b/tools/VisualBench/VisualBench.cpp
index 154c84b6f28c570ccc1190bd555836448e29f450..7f2e90c43fd1bd62f8f5c75a4665c545b36ba90f 100644
--- a/tools/VisualBench/VisualBench.cpp
+++ b/tools/VisualBench/VisualBench.cpp
@@ -106,7 +106,7 @@ void VisualBench::resetContext() {
 
 void VisualBench::setupContext() {
     int screenSamples = FLAGS_offscreen ? 0 : FLAGS_msaa;
-    if (!this->attach(kNativeGL_BackEndType, screenSamples, &fAttachmentInfo)) {
+    if (!this->attach(kNativeGL_BackEndType, screenSamples, false, &fAttachmentInfo)) {
         SkDebugf("Not possible to create backend.\n");
         INHERITED::release();
         SkFAIL("Could not create backend\n");