Extract Scoped{FrameBuffer,Texture}Binder and clean up TFP in VAVDA.

content/common/gpu/gl_scoped_binders.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/common/gpu/gl_scoped_binders.h"
+#include "ui/gl/gl_bindings.h"
+
+namespace content {
+
+ScopedFrameBufferBinder::ScopedFrameBufferBinder(unsigned int fbo) {
+  glGetIntegerv(GL_FRAMEBUFFER_BINDING, &old_fbo_);
+  glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
+}
+
+ScopedFrameBufferBinder::~ScopedFrameBufferBinder() {
+  glBindFramebufferEXT(GL_FRAMEBUFFER, old_fbo_);
+}
+
+ScopedTextureBinder::ScopedTextureBinder(unsigned int id) {
+  glGetIntegerv(GL_TEXTURE_BINDING_2D, &old_id_);
+  glBindTexture(GL_TEXTURE_2D, id);
+}
+
+ScopedTextureBinder::~ScopedTextureBinder() {
+  glBindTexture(GL_TEXTURE_2D, old_id_);
+}
+
+}  // namespace content