Implement a means of letting native VR Shell control the HTML UI.

chrome/browser/android/vr_shell/ui_interface.cc

+// Copyright 2016 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_interface.h"
+
+#include "chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.h"
+
+namespace vr_shell {
+
+UiInterface::UiInterface() {
+  SetMode(Mode::STANDARD);
+}
+
+UiInterface::~UiInterface() {}
+
+void UiInterface::SetUiMessageHandler(VrShellUIMessageHandler* handler) {
+  handler_ = handler;
+}
+
+void UiInterface::SetMode(Mode mode) {
+  updates_.SetInteger("mode", static_cast<int>(mode));
+  FlushUpdates();
+}
+
+void UiInterface::SetSecureOrigin(bool secure) {
+  updates_.SetBoolean("secureOrigin", static_cast<int>(secure));
+  FlushUpdates();
+}
+
+void UiInterface::OnDomContentsLoaded() {
+  loaded_ = true;
+  FlushUpdates();
+}
+
+void UiInterface::FlushUpdates() {
+  if (loaded_ && handler_) {
+    handler_->SendCommandToUi(updates_);
+    updates_.Clear();
+  }
+}
+
+}  // namespace vr_shell