Initial version of external_oes texture support and unit test

src/gpu/gl/egl/GrGLCreateNativeInterface_egl.cpp

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLAssembleInterface.h"
 #include "gl/GrGLUtil.h"
 
 #include <EGL/egl.h>
 #include <GLES2/gl2.h>
 
 static GrGLFuncPtr egl_get_gl_proc(void* ctx, const char name[]) {
     SkASSERT(nullptr == ctx);
-    return eglGetProcAddress(name);
+    GrGLFuncPtr ptr = eglGetProcAddress(name);
+    if (!ptr) {
+        if (0 == strcmp("eglQueryString", name)) {
+            return (GrGLFuncPtr)eglQueryString;
+        } else if (0 == strcmp("eglGetCurrentDisplay", name)) {
+            return (GrGLFuncPtr)eglGetCurrentDisplay;
+        }
+    }
+    return ptr;
 }
 
 const GrGLInterface* GrGLCreateNativeInterface() {
     return GrGLAssembleInterface(nullptr, egl_get_gl_proc);
 }