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

ui/gl/gl_image_shm.h

 // Copyright 2013 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 UI_GL_GL_IMAGE_SHM_H_
 #define UI_GL_GL_IMAGE_SHM_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_image.h"
 
 namespace gfx {
 
 class GL_EXPORT GLImageShm : public GLImage {
  public:
   GLImageShm(gfx::Size size, unsigned internalformat);
 
   bool Initialize(gfx::GpuMemoryBufferHandle buffer);
 
   // Overridden from GLImage:
-  virtual void Destroy() OVERRIDE;
+  virtual void Destroy(bool have_context) OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual bool BindTexImage(unsigned target) OVERRIDE;
   virtual void ReleaseTexImage(unsigned target) OVERRIDE {}
   virtual void WillUseTexImage() OVERRIDE {}
   virtual void DidUseTexImage() OVERRIDE {}
   virtual void WillModifyTexImage() OVERRIDE {}
   virtual void DidModifyTexImage() OVERRIDE {}
 
  protected:
   virtual ~GLImageShm();
 
  private:
   scoped_ptr<base::SharedMemory> shared_memory_;
   gfx::Size size_;
   unsigned internalformat_;
 #if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || \
     defined(USE_OZONE)
   GLuint egl_texture_id_;
   EGLImageKHR egl_image_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(GLImageShm);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMAGE_SHM_H_