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

src/gpu/gl/nacl/SkNativeGLContext_nacl.cpp

+
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "gl/SkNativeGLContext.h"
+
+SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
+}
+
+SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
+}
+
+SkNativeGLContext::SkNativeGLContext()
+    : fContext(NULL)
+    , fDisplay(NULL)
+{
+}
+
+SkNativeGLContext::~SkNativeGLContext() {
+    this->destroyGLContext();
+}
+
+void SkNativeGLContext::destroyGLContext() {
+}
+
+const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
+    return NULL;
+}
+
+void SkNativeGLContext::makeCurrent() const {
+}
+
+void SkNativeGLContext::swapBuffers() const {
+}