VrShell: implement insecure content warning display

chrome/browser/android/vr_shell/vr_shell.h

Index: chrome/browser/android/vr_shell/vr_shell.h
diff --git a/chrome/browser/android/vr_shell/vr_shell.h b/chrome/browser/android/vr_shell/vr_shell.h
index b56bf409d90fb6c0b9eb421dd842e5695af46dee..4729afc77138530885734ebaaad780acaf00b7a2 100644
--- a/chrome/browser/android/vr_shell/vr_shell.h
+++ b/chrome/browser/android/vr_shell/vr_shell.h
@@ -86,6 +86,9 @@ class VrShell : public device::GvrDelegate {
                const gvr::BufferViewport& params);
   void DrawContentRect();
   void DrawWebVr();
+  void DrawWebVrOverlay();
+  void DrawWebVrEye(const gvr::Mat4f& view_matrix,
+                    const gvr::BufferViewport& params);
   void DrawUI();
   void DrawCursor();
 
@@ -129,7 +132,8 @@ class VrShell : public device::GvrDelegate {
   int ui_tex_height_ = 0;
 
   bool webvr_mode_ = false;
-  bool webvr_secure_origin_;
+  bool webvr_secure_origin_ = false;
+  int webvr_warning_frames_ = 0;
 
   base::WeakPtrFactory<VrShell> weak_ptr_factory_;