Split //ui/gl into //ui/gl + //ui/gi/init.

ui/gl/gl_image_stub.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_STUB_H_
 #define UI_GL_GL_IMAGE_STUB_H_
 
 #include <stdint.h>
 
+#include "ui/gl/gl_export.h"
 #include "ui/gl/gl_image.h"
 
 namespace gl {
 
 // A GLImage that does nothing for unit tests.
 class GL_EXPORT GLImageStub : public GLImage {
  public:
   GLImageStub();
 
   // Overridden from GLImage:
@@ skipping 15 matching lines @@
                     uint64_t process_tracing_id,
                     const std::string& dump_name) override {}
 
  protected:
   ~GLImageStub() override;
 };
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_IMAGE_STUB_H_