Store null GL context's state in interface object

include/gpu/gl/SkNullGLContext.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 SkNullGLContext_DEFINED
 #define SkNullGLContext_DEFINED
 
 #include "gl/SkGLContext.h"
 
 class SK_API SkNullGLContext : public SkGLContext {
 public:
     ~SkNullGLContext() override;
-
     static SkNullGLContext* Create();
-    // FIXME: remove once Chromium has been updated.
-    static SkNullGLContext* Create(GrGLStandard forcedAPI) {
-        SkASSERT(forcedAPI == kNone_GrGLStandard);
-        (void)forcedAPI;        return Create();
-    }
-
-    class ContextState;
 
 private:
     SkNullGLContext();
 
-    void onPlatformMakeCurrent() const override;
+    void onPlatformMakeCurrent() const override {};
     void onPlatformSwapBuffers() const override {}
-    GrGLFuncPtr onPlatformGetProcAddress(const char*) const override { return NULL; }
-
-    ContextState* fState;
+    GrGLFuncPtr onPlatformGetProcAddress(const char*) const override { return nullptr; }
 };
 
 #endif