Revert of Make the Sk GL context class an abstract base class

include/gpu/gl/SkNativeGLContext.h

Index: include/gpu/gl/SkNativeGLContext.h
diff --git a/include/gpu/gl/SkNativeGLContext.h b/include/gpu/gl/SkNativeGLContext.h
new file mode 100644
index 0000000000000000000000000000000000000000..93b5b4183ac34794a5cf21c4f288137a346f185c
--- /dev/null
+++ b/include/gpu/gl/SkNativeGLContext.h
@@ -0,0 +1,111 @@
+
+/*
+ * 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 SkNativeGLContext_DEFINED
+#define SkNativeGLContext_DEFINED
+
+#include "SkGLContextHelper.h"
+
+/* This struct is taken from a mesa demo.  Please update as required */
+static const struct { int major, minor; } gl_versions[] = {
+   {1, 0},
+   {1, 1},
+   {1, 2},
+   {1, 3},
+   {1, 4},
+   {1, 5},
+   {2, 0},
+   {2, 1},
+   {3, 0},
+   {3, 1},
+   {3, 2},
+   {3, 3},
+   {4, 0},
+   {4, 1},
+   {4, 2},
+   {4, 3},
+   {4, 4},
+   {0, 0} /* end of list */
+};
+#define NUM_GL_VERSIONS SK_ARRAY_COUNT(gl_versions)
+
+#if defined(SK_BUILD_FOR_MAC)
+    #include <OpenGL/OpenGL.h>
+#elif SK_EGL
+    #include <GLES2/gl2.h>
+    #include <EGL/egl.h>
+#elif defined(SK_BUILD_FOR_UNIX)
+    #include <X11/Xlib.h>
+    #include <GL/glx.h>
+#elif defined(SK_BUILD_FOR_WIN32)
+    #include <windows.h>
+    #include <GL/GL.h>
+    #include "SkWGL.h"
+#endif
+
+class SkNativeGLContext : public SkGLContextHelper {
+public:
+    SkNativeGLContext();
+
+    virtual ~SkNativeGLContext();
+
+    virtual void makeCurrent() const SK_OVERRIDE;
+    virtual void swapBuffers() const SK_OVERRIDE;
+
+    class AutoContextRestore {
+    public:
+        AutoContextRestore();
+        ~AutoContextRestore();
+
+    private:
+    #if defined(SK_BUILD_FOR_MAC)
+        CGLContextObj fOldCGLContext;
+    #elif SK_EGL
+        EGLContext fOldEGLContext;
+        EGLDisplay fOldDisplay;
+        EGLSurface fOldSurface;
+    #elif defined(SK_BUILD_FOR_UNIX)
+        GLXContext fOldGLXContext;
+        Display* fOldDisplay;
+        GLXDrawable fOldDrawable;
+    #elif defined(SK_BUILD_FOR_WIN32)
+        HDC fOldHDC;
+        HGLRC fOldHGLRC;
+
+    #elif defined(SK_BUILD_FOR_IOS)
+        void* fEAGLContext;
+    #endif
+    };
+
+protected:
+    virtual const GrGLInterface* createGLContext(GrGLStandard forcedGpuAPI) SK_OVERRIDE;
+    virtual void destroyGLContext() SK_OVERRIDE;
+
+private:
+#if defined(SK_BUILD_FOR_MAC)
+    CGLContextObj fContext;
+#elif SK_EGL
+    EGLContext fContext;
+    EGLDisplay fDisplay;
+    EGLSurface fSurface;
+#elif defined(SK_BUILD_FOR_UNIX)
+    GLXContext fContext;
+    Display* fDisplay;
+    Pixmap fPixmap;
+    GLXPixmap fGlxPixmap;
+#elif defined(SK_BUILD_FOR_WIN32)
+    HWND fWindow;
+    HDC fDeviceContext;
+    HGLRC fGlRenderContext;
+    static ATOM gWC;
+    SkWGLPbufferContext* fPbufferContext;
+#elif defined(SK_BUILD_FOR_IOS)
+    void* fEAGLContext;
+#endif
+};
+
+#endif