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 f5c76e93937090ddd0f7540554915b8232ee61c9..d24a1b68173b2f711076aa4734c9388d2b411eef 100644
--- a/chrome/browser/android/vr_shell/vr_shell.h
+++ b/chrome/browser/android/vr_shell/vr_shell.h
@@ -93,6 +93,10 @@ class VrShell : public device::GvrDelegate {
                const gvr::BufferViewport& params);
   void DrawContentRect();
   void DrawWebVr();
+  void DrawWebVrOverlay(int64_t present_time_nanos);
+  void DrawWebVrEye(const gvr::Mat4f& view_matrix,
+                    const gvr::BufferViewport& params,
+                    int64_t present_time_nanos);
   void DrawUI();
   void DrawCursor();
 
@@ -141,7 +145,8 @@ class VrShell : public device::GvrDelegate {
   int ui_tex_height_ = 0;
 
   bool webvr_mode_ = false;
-  bool webvr_secure_origin_;
+  bool webvr_secure_origin_ = false;
+  int64_t webvr_warning_end_nanos_ = 0;
 
   base::WeakPtrFactory<VrShell> weak_ptr_factory_;