Move GLSurface creation from //ui/gl to //ui/gl/init.

ui/gl/gl_surface_osmesa.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_SURFACE_OSMESA_H_
 #define UI_GL_GL_SURFACE_OSMESA_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 31 matching lines @@
   gfx::Size size_;
   GLSurface::Format format_;
   std::unique_ptr<int32_t[]> buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceOSMesa);
 };
 
 // A thin subclass of |GLSurfaceOSMesa| that can be used in place
 // of a native hardware-provided surface when a native surface
 // provider is not available.
-class GLSurfaceOSMesaHeadless : public GLSurfaceOSMesa {
+class GL_EXPORT GLSurfaceOSMesaHeadless : public GLSurfaceOSMesa {
  public:
-  explicit GLSurfaceOSMesaHeadless();
+  GLSurfaceOSMesaHeadless();
 
   bool IsOffscreen() override;
   gfx::SwapResult SwapBuffers() override;
 
  protected:
   ~GLSurfaceOSMesaHeadless() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceOSMesaHeadless);
 };
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_SURFACE_OSMESA_H_