Create child window in GPU process for DirectComposition

ui/gl/gl_surface_egl.h

Index: ui/gl/gl_surface_egl.h
diff --git a/ui/gl/gl_surface_egl.h b/ui/gl/gl_surface_egl.h
index 7231aa59430110ad7031c94cd42124ce050fdbbd..3ed6c985add278a62d827259b2221c898368b39b 100644
--- a/ui/gl/gl_surface_egl.h
+++ b/ui/gl/gl_surface_egl.h
@@ -63,6 +63,7 @@ class GL_EXPORT GLSurfaceEGL : public GLSurface {
   static bool HasEGLExtension(const char* name);
   static bool IsCreateContextRobustnessSupported();
   static bool IsEGLSurfacelessContextSupported();
+  static bool IsDirectCompositionSupported();
 
  protected:
   ~GLSurfaceEGL() override;
@@ -112,6 +113,8 @@ class GL_EXPORT NativeViewGLSurfaceEGL : public GLSurfaceEGL {
   EGLNativeWindowType window_;
   EGLConfig config_;
   gfx::Size size_;
+  bool alpha_;
+  bool enable_fixed_size_angle_;
 
   void OnSetSwapInterval(int interval) override;
 
@@ -122,7 +125,6 @@ class GL_EXPORT NativeViewGLSurfaceEGL : public GLSurfaceEGL {
 
   EGLSurface surface_;
   bool supports_post_sub_buffer_;
-  bool alpha_;
 
   scoped_ptr<VSyncProvider> vsync_provider_;