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

src/views/sdl/SkOSWindow_SDL.cpp

Index: src/views/sdl/SkOSWindow_SDL.cpp
diff --git a/src/views/sdl/SkOSWindow_SDL.cpp b/src/views/sdl/SkOSWindow_SDL.cpp
index 76d43498e8ff7f3c79fe0248a532e51df52350a6..88b8353b6c0b10167c1b51c753823da802f8ccf4 100644
--- a/src/views/sdl/SkOSWindow_SDL.cpp
+++ b/src/views/sdl/SkOSWindow_SDL.cpp
@@ -57,7 +57,8 @@ void SkOSWindow::release() {
     }
 }
 
-bool SkOSWindow::attach(SkBackEndTypes attachType, int msaaSampleCount, AttachmentInfo* info) {
+bool SkOSWindow::attach(SkBackEndTypes attachType, int msaaSampleCount, bool deepColor,
+                        AttachmentInfo* info) {
     this->createWindow(msaaSampleCount);
     if (!fWindow) {
         return false;