Added disabling EGL extensions support with --disable-extensions.

ui/gl/gl_egl_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_EGL_API_IMPLEMENTATION_H_
 #define UI_GL_GL_EGL_API_IMPLEMENTATION_H_
 
+#include <vector>
+
 #include "base/compiler_specific.h"
 #include "gl_bindings.h"
 #include "ui/gl/gl_export.h"
 
+namespace base {
+class CommandLine;
+}
 namespace gfx {
 
 class GLContext;
 struct GLWindowSystemBindingInfo;
 
 void InitializeStaticGLBindingsEGL();
 void InitializeDebugGLBindingsEGL();
 void ClearGLBindingsEGL();
 bool GetGLWindowSystemBindingInfoEGL(GLWindowSystemBindingInfo* info);
 
@@ skipping 10 matching lines @@
   void InitializeBase(DriverEGL* driver);
 
   DriverEGL* driver_;
 };
 
 class GL_EXPORT RealEGLApi : public EGLApiBase {
  public:
   RealEGLApi();
   ~RealEGLApi() override;
   void Initialize(DriverEGL* driver);
+  void InitializeWithCommandLine(DriverEGL* driver,
+                                 base::CommandLine* command_line);
+  void InitializeFilteredExtensions();
+
+  const char* eglQueryStringFn(EGLDisplay dpy, EGLint name) override;
+
+ private:
+  // Filtered EGL_EXTENSIONS we return to eglQueryStringFn() calls.
+  std::vector<std::string> disabled_exts_;
+  std::string filtered_exts_;
 };
 
 
 // Inserts a TRACE for every EGL call.
 class GL_EXPORT TraceEGLApi : public EGLApi {
  public:
   TraceEGLApi(EGLApi* egl_api) : egl_api_(egl_api) { }
   ~TraceEGLApi() 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
   // this file instead of having to edit some template or the code generator.
   #include "gl_bindings_api_autogen_egl.h"
 
  private:
   EGLApi* egl_api_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_EGL_API_IMPLEMENTATION_H_