adds WARP support to Chromium, for Metro mode only, on Windows 8

ui/gl/gl_surface_egl.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_EGL_H_
 #define UI_GL_GL_SURFACE_EGL_H_
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
@@ skipping 29 matching lines @@
   // initialization guards.
   static const char* GetEGLExtensions();
   static bool HasEGLExtension(const char* name);
   static bool IsCreateContextRobustnessSupported();
   static bool IsEGLSurfacelessContextSupported();
 
  protected:
   virtual ~GLSurfaceEGL();
 
  private:
+#if defined(OS_WIN)
+  static EGLDisplay GetPlatformDisplay(EGLNativeDisplayType native_display);
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceEGL);
 };
 
 // Encapsulates an EGL surface bound to a view.
 class GL_EXPORT NativeViewGLSurfaceEGL : public GLSurfaceEGL {
  public:
   explicit NativeViewGLSurfaceEGL(EGLNativeWindowType window);
 
   // Implement GLSurface.
   virtual EGLConfig GetConfig() OVERRIDE;
@@ skipping 77 matching lines @@
   virtual ~SurfacelessEGL();
 
  private:
   gfx::Size size_;
   DISALLOW_COPY_AND_ASSIGN(SurfacelessEGL);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_SURFACE_EGL_H_