VR: Render the current URL and security level on the URL bar.

chrome/browser/android/vr_shell/ui_elements/url_bar.cc

Index: chrome/browser/android/vr_shell/ui_elements/url_bar.cc
diff --git a/chrome/browser/android/vr_shell/ui_elements/url_bar.cc b/chrome/browser/android/vr_shell/ui_elements/url_bar.cc
index 7e8d9c49a9b0c6d3c0fa5a5da06e9c33362c7179..87deb9213c874d4610fbbf9601d7c5540650af16 100644
--- a/chrome/browser/android/vr_shell/ui_elements/url_bar.cc
+++ b/chrome/browser/android/vr_shell/ui_elements/url_bar.cc
@@ -15,6 +15,10 @@ UrlBar::UrlBar(int preferred_width)
 
 UrlBar::~UrlBar() = default;
 
+UiTexture* UrlBar::GetTexture() const {
+  return texture_.get();
+}
+
 void UrlBar::OnHoverEnter() {
   texture_->SetHover(true);
   Update();
@@ -25,12 +29,35 @@ void UrlBar::OnHoverLeave() {
   Update();
 }
 
-UiTexture* UrlBar::GetTexture() const {
-  return texture_.get();
+void UrlBar::OnButtonUp() {
+  back_button_callback_.Run();
+}
+
+void UrlBar::SetEnabled(bool enabled) {
+  if (enabled && !enabled_) {
+    Update();
+  }
+  enabled_ = enabled;
 }
 
 void UrlBar::SetURL(const GURL& gurl) {
+  // TODO(cjgrant): See if we get duplicate security level numbers, despite the
+  // source of this information being called "on changed". Also, consider
+  // delaying the texture update slighly, such that back-to-back URL and
+  // security state changes generate a single texture update instead of two.
   texture_->SetURL(gurl);
+  if (enabled_)
+    Update();
+}
+
+void UrlBar::SetSecurityLevel(int level) {
+  texture_->SetSecurityLevel(level);
+  if (enabled_)
+    Update();
+}
+
+void UrlBar::SetBackButtonCallback(const base::Callback<void()>& callback) {
+  back_button_callback_ = callback;
 }
 
 }  // namespace vr_shell