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

include/views/SkOSWindow_iOS.h

Index: include/views/SkOSWindow_iOS.h
diff --git a/include/views/SkOSWindow_iOS.h b/include/views/SkOSWindow_iOS.h
index 5a8b2e3d2f99c86d4092c8523d82ac65a1a341bc..c0b2fc3f0ae3d4a31463ef42b4dd2c8f73614fca 100644
--- a/include/views/SkOSWindow_iOS.h
+++ b/include/views/SkOSWindow_iOS.h
@@ -22,7 +22,8 @@ public:
     };
 
     void    release();
-    bool    attach(SkBackEndTypes attachType, int msaaSampleCount, AttachmentInfo*);
+    bool    attach(SkBackEndTypes attachType, int msaaSampleCount, bool deepColor,
+                   AttachmentInfo*);
     void    present();
 
     bool makeFullscreen() { return true; }