Fix gl context change on dropping a texture

ui/gfx/compositor/compositor_gl.cc

 // Copyright (c) 2011 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 "ui/gfx/compositor/compositor_gl.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 310 matching lines @@
 TextureGL::TextureGL() : texture_id_(0) {
 }
 
 TextureGL::TextureGL(const gfx::Size& size) : texture_id_(0), size_(size) {
 }
 
 TextureGL::~TextureGL() {
   if (texture_id_) {
     SharedResourcesGL* instance = SharedResourcesGL::GetInstance();
     DCHECK(instance);
-    instance->MakeSharedContextCurrent();
+    scoped_refptr<gfx::ScopedMakeCurrent> bind =
+        instance->ScopedMakeCurrent();
     glDeleteTextures(1, &texture_id_);
   }
 }
 
 void TextureGL::SetCanvas(const SkCanvas& canvas,
                           const gfx::Point& origin,
                           const gfx::Size& overall_size) {
   const SkBitmap& bitmap = canvas.getDevice()->accessBitmap(false);
   // Verify bitmap pixels are contiguous.
   DCHECK_EQ(bitmap.rowBytes(),
@@ skipping 206 matching lines @@
 Compositor* Compositor::Create(CompositorDelegate* owner,
                                gfx::AcceleratedWidget widget,
                                const gfx::Size& size) {
   if (SharedResourcesGL::GetInstance() == NULL)
     return NULL;
   else
     return new CompositorGL(owner, widget, size);
 }
 
 }  // namespace ui