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

ui/gl/gl_image_glx.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 UI_GL_GL_IMAGE_GLX_H_
 #define UI_GL_GL_IMAGE_GLX_H_
 
 #include "ui/gfx/size.h"
 #include "ui/gfx/x/x11_types.h"
 #include "ui/gl/gl_export.h"
 #include "ui/gl/gl_image.h"
 
 namespace gfx {
 
 class GL_EXPORT GLImageGLX : public GLImage {
  public:
   explicit GLImageGLX(gfx::PluginWindowHandle window);
 
   virtual bool Initialize();
 
   // Overridden from GLImage:
-  virtual void Destroy() OVERRIDE;
+  virtual void Destroy(bool have_context) OVERRIDE;

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

I think this will fail to compile. You need to update the .cc file too. Please
verify that Destroy has been called in the dtor instead of calling it from
there.

   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 ~GLImageGLX();
 
  private:
   XDisplay* display_;
   gfx::PluginWindowHandle window_;
   XID pixmap_;
   XID glx_pixmap_;
   gfx::Size size_;
 
   DISALLOW_COPY_AND_ASSIGN(GLImageGLX);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMAGE_GLX_H_