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

include/views/SkOSWindow_Unix.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkOSWindow_Unix_DEFINED
 #define SkOSWindow_Unix_DEFINED
 
@@ skipping 21 matching lines @@
     void* getDisplay() const { return (void*)fUnixWindow.fDisplay; }
     void* getUnixWindow() const { return (void*)&fUnixWindow; }
     void loop();
     void post_linuxevent();
 
     enum SkBackEndTypes {
         kNone_BackEndType,
         kNativeGL_BackEndType,
     };
 
-    bool attach(SkBackEndTypes attachType, int msaaSampleCount);
+    struct AttachmentInfo {
+        int fSampleCount;
+        int fStencilBits;
+    };
+
+    bool attach(SkBackEndTypes attachType, int msaaSampleCount, AttachmentInfo*);
     void detach();
     void present();
 
     int getMSAASampleCount() const { return fMSAASampleCount; }
 
     //static bool PostEvent(SkEvent* evt, SkEventSinkID, SkMSec delay);
 
 protected:
     // Overridden from from SkWindow:
     virtual bool onEvent(const SkEvent&) SK_OVERRIDE;
     virtual void onHandleInval(const SkIRect&) SK_OVERRIDE;
     virtual bool onHandleChar(SkUnichar) SK_OVERRIDE;
     virtual bool onHandleKey(SkKey) SK_OVERRIDE;
     virtual bool onHandleKeyUp(SkKey) SK_OVERRIDE;
     virtual void onSetTitle(const char title[]) SK_OVERRIDE;
 
 private:
     void doPaint();
     void mapWindowAndWait();
 
     void closeWindow();
-    void initWindow(int newMSAASampleCount);
+    void initWindow(int newMSAASampleCount, AttachmentInfo* info);
 
     SkUnixWindow fUnixWindow;
 
     // Needed for GL
     XVisualInfo* fVi;
     // we recreate the underlying xwindow if this changes
     int fMSAASampleCount;
 
     typedef SkWindow INHERITED;
 };
 
 #endif