Fix disabled extensions for virtual contexts and respect command line.

ui/gl/gl_gl_api_implementation.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_GL_API_IMPLEMENTATION_H_
 #define UI_GL_GL_GL_API_IMPLEMENTATION_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 106 matching lines @@
  public:
   VirtualGLApi();
   ~VirtualGLApi() override;
   void Initialize(DriverGL* driver, GLContext* real_context);
 
   // Sets the current virutal context.
   bool MakeCurrent(GLContext* virtual_context, GLSurface* surface);
 
   void OnReleaseVirtuallyCurrent(GLContext* virtual_context);
 
-private:
+ private:
   // Overridden functions from GLApiBase
- const GLubyte* glGetStringFn(GLenum name) override;
- void glFinishFn() override;
- void glFlushFn() override;
+  void glGetIntegervFn(GLenum pname, GLint* params) override;
+  const GLubyte* glGetStringFn(GLenum name) override;
+  const GLubyte* glGetStringiFn(GLenum name, GLuint index) override;
+  void glFinishFn() override;
+  void glFlushFn() override;
 
   // The real context we're running on.
   GLContext* real_context_;
 
   // The current virtual context.
   GLContext* current_context_;
 
   // The supported extensions being advertised for this virtual context.
   std::string extensions_;
+  std::vector<std::string> extensions_vec_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_GL_API_IMPLEMENTATION_H_