Clean up EGL thread state at thread exit in nanobench and DM

src/gpu/gl/nacl/SkCreatePlatformGLContext_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/SkGLContext.h"
 
 SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI, SkGLContext* shareContext) {
     SkASSERT(!shareContext);
     return nullptr;
 }
+void SkReleasePlatformGLAPIsInThread() {
+}