Make SkOSWindow return the sample count and stencil bit count for its GL context.

include/views/SkOSWindow_iOS.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkOSWindow_iOS_DEFINED
 #define SkOSWindow_iOS_DEFINED
 
 #include "SkWindow.h"
 
 class SkOSWindow : public SkWindow {
 public:
     SkOSWindow(void* hwnd);
     ~SkOSWindow();
     void*   getHWND() const { return fHWND; }
 
     enum SkBackEndTypes {
         kNone_BackEndType,
         kNativeGL_BackEndType,
     };
 
+    struct AttachmentInfo {
+        int fSampleCount;
+        int fStencilBits;
+    };
+
     void    detach();
-    bool    attach(SkBackEndTypes attachType, int msaaSampleCount);
+    bool    attach(SkBackEndTypes attachType, int msaaSampleCount, AttachmentInfo*);
     void    present();
 
 protected:
     // overrides from SkEventSink
     virtual bool onEvent(const SkEvent& evt);
     // overrides from SkWindow
     virtual void onHandleInval(const SkIRect&);
     // overrides from SkView
     virtual void onAddMenu(const SkOSMenu*);
     virtual void onUpdateMenu(SkOSMenu*);
     virtual void onSetTitle(const char[]);
 
 private:
     void*   fHWND;
     bool    fInvalEventIsPending;
     void*   fNotifier;
     typedef SkWindow INHERITED;
 };
 
 #endif