Unify wgl context creation.

include/utils/SkWGL.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.
  */
 
 #include "SkRefCnt.h"
 
@@ skipping 88 matching lines @@
     typedef BOOL (WINAPI *GetPixelFormatAttribfvProc)(HDC hdc, int, int, UINT, const int*, FLOAT*);
     typedef HGLRC (WINAPI *CreateContextAttribsProc)(HDC hDC, HGLRC, const int *);
 
     GetExtensionsStringProc fGetExtensionsString;
     ChoosePixelFormatProc fChoosePixelFormat;
     GetPixelFormatAttribfvProc fGetPixelFormatAttribfv;
     GetPixelFormatAttribivProc fGetPixelFormatAttribiv;
     CreateContextAttribsProc fCreateContextAttribs;
 };
 
+/**
+ * Helper to create an OpenGL context for a DC using WGL. Configs with a sample count >= to
+ * msaaSampleCount are preferred but if none is available then a context with a lower sample count
+ * (including non-MSAA) will be created. If preferCoreProfile is true but a core profile cannot be
+ * created then a compatible profile context will be created.
+ */
+HGLRC SkCreateWGLContext(HDC dc, int msaaSampleCount, bool preferCoreProfile);
+
 #endif