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

example/HelloWorld.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 "HelloWorld.h"
@@ skipping 44 matching lines @@
 void HelloWorldWindow::setTitle() {
     SkString title("Hello World ");
     title.appendf(fType == kRaster_DeviceType ? "raster" : "opengl");
     INHERITED::setTitle(title.c_str());
 }
 
 bool HelloWorldWindow::setUpBackend() {
     this->setVisibleP(true);
     this->setClipToBounds(false);
 
-    bool result = attach(kNativeGL_BackEndType, 0 /*msaa*/, &fAttachmentInfo);
+    bool result = attach(kNativeGL_BackEndType, 0 /*msaa*/, false, &fAttachmentInfo);
     if (false == result) {
         SkDebugf("Not possible to create backend.\n");
         release();
         return false;
     }
 
     fInterface = GrGLCreateNativeInterface();
 
     SkASSERT(NULL != fInterface);
 
@@ skipping 102 matching lines @@
         setUpBackend();
         this->setTitle();
         this->inval(NULL);
     }
     return true;
 }
 
 SkOSWindow* create_sk_window(void* hwnd, int , char** ) {
     return new HelloWorldWindow(hwnd);
 }