During image destroy, delete textures only if we have a GL context.

gpu/command_buffer/service/image_manager.h

 // 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_IMAGE_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_IMAGE_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "gpu/command_buffer/service/gpu_memory_buffer_manager.h"
 #include "gpu/gpu_export.h"
 
 namespace gfx {
 class GLImage;
 }
 
 namespace gpu {
 namespace gles2 {
 
 // Interface used by the cmd decoder to lookup images.
 class GPU_EXPORT ImageManager
     : public GpuMemoryBufferManagerInterface,
       public base::RefCounted<ImageManager> {
  public:
   ImageManager();
 
+  virtual void Destroy(bool have_context);

[reveman, 2014/05/29 16:30:34]

Why virtual?

+
   // Overridden from GpuMemoryBufferManagerInterface:
   virtual void RegisterGpuMemoryBuffer(int32 id,
                                        gfx::GpuMemoryBufferHandle buffer,
                                        size_t width,
                                        size_t height,
                                        unsigned internalformat) OVERRIDE;
   virtual void UnregisterGpuMemoryBuffer(int32 id) OVERRIDE;
 
   void AddImage(gfx::GLImage* gl_image, int32 service_id);
   void RemoveImage(int32 service_id);
@@ skipping 11 matching lines @@
   GLImageMap gl_images_;
   bool release_after_use_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageManager);
 };
 
 }  // namespage gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_IMAGE_MANAGER_H_