Fix GL extension filtering so that extension bits are set correctly.

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 50 matching lines @@
   void Initialize(DriverGL* driver);
   void InitializeWithCommandLine(DriverGL* driver,
                                  base::CommandLine* command_line);
 
   void InitializeWithContext();
 
   void glGetIntegervFn(GLenum pname, GLint* params) override;
   const GLubyte* glGetStringFn(GLenum name) override;
   const GLubyte* glGetStringiFn(GLenum name, GLuint index) override;
 
+  void InitializeFilteredExtensions();
+
  private:
-  void InitializeFilteredExtensions();
   void glFinishFn() override;
   void glFlushFn() override;
 
   // Filtered GL_EXTENSIONS we return to glGetString(i) calls.
   std::vector<std::string> disabled_exts_;
   std::vector<std::string> filtered_exts_;
   std::string filtered_exts_str_;
+
+#if DCHECK_IS_ON()
+  bool filtered_exts_initialized_;
+#endif
 };
 
 // Inserts a TRACE for every GL call.
 class TraceGLApi : public GLApi {
  public:
   TraceGLApi(GLApi* gl_api) : gl_api_(gl_api) { }
   ~TraceGLApi() override;
 
   // Include the auto-generated part of this class. We split this because
   // it means we can easily edit the non-auto generated parts right here in
@@ skipping 51 matching lines @@
   ScopedSetGLToRealGLApi();
   ~ScopedSetGLToRealGLApi();
 
  private:
   GLApi* old_gl_api_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_GL_API_IMPLEMENTATION_H_