Support rendering Android Native Pages in VR Shell.

chrome/browser/android/vr_shell/vr_shell_gl.h

Index: chrome/browser/android/vr_shell/vr_shell_gl.h
diff --git a/chrome/browser/android/vr_shell/vr_shell_gl.h b/chrome/browser/android/vr_shell/vr_shell_gl.h
index c394cd50762bcc8ffe2127c4d1ba185259635fa0..dadaf834fc169ecf6dd21d5702f9ff4118c5ada0 100644
--- a/chrome/browser/android/vr_shell/vr_shell_gl.h
+++ b/chrome/browser/android/vr_shell/vr_shell_gl.h
@@ -71,6 +71,7 @@ class VrShellGl : public device::mojom::VRVSyncProvider {
   void OnResume();
 
   void SetWebVrMode(bool enabled);
+  void CreateContentSurface();
   void ContentBoundsChanged(int width, int height);
   void ContentPhysicalBoundsChanged(int width, int height);
   void UIBoundsChanged(int width, int height);
@@ -112,7 +113,7 @@ class VrShellGl : public device::mojom::VRVSyncProvider {
                           int pixel_y);
   void SendGesture(InputTarget input_target,
                    std::unique_ptr<blink::WebInputEvent> event);
-
+  void CreateUiSurface();
   void OnUIFrameAvailable();
   void OnContentFrameAvailable();
   bool GetPixelEncodedFrameIndex(uint16_t* frame_index);