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

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/vr_shell/ui_elements/url_bar.h"
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/android/vr_shell/textures/url_bar_texture.h"
 
 namespace vr_shell {
 
 UrlBar::UrlBar(int preferred_width)
     : TexturedElement(preferred_width),
       texture_(base::MakeUnique<UrlBarTexture>()) {}
 
 UrlBar::~UrlBar() = default;
 
+UiTexture* UrlBar::GetTexture() const {
+  return texture_.get();
+}
+
 void UrlBar::OnHoverEnter() {
   texture_->SetHover(true);
   Update();
 }
 
 void UrlBar::OnHoverLeave() {
   texture_->SetHover(false);
   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