PROTOTYPE (incomplete): Add quad renderer and stub bits to handle security warnings.

chrome/browser/android/vr_shell/ui_scene_manager.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_scene_manager.h"
 
 #include "base/memory/ptr_util.h"
+#include "chrome/browser/android/vr_shell/textured_element.h"
+#include "chrome/browser/android/vr_shell/textures/ui_texture.h"
 #include "chrome/browser/android/vr_shell/ui_element.h"
 #include "chrome/browser/android/vr_shell/ui_scene.h"
 
 namespace vr_shell {
 
 namespace {
 
+class SecurityWarning : public TexturedElement {

[cjgrant, 2017/04/19 16:24:52]

Temporary home - these shouldn't be in this file.

+ public:
+  SecurityWarning() {
+    //glGenTextures(1, &texture_id_);
+    //texture_ = base::make_unique<InsecureContentPermanentTexture>(texture_id, 1);
+
+    // Draw the texture once since it does not change.
+    //texture_->Draw();

[cjgrant, 2017/04/19 16:24:52]

I figure drawing the one-off textures in the constructor is okay.

+  }
+
+  ~SecurityWarning() override {}
+
+  bool Render(VrShellRenderer* renderer) const override {
+    // Use the Skia quad renderer.
+    return true;
+  }
+
+ private:
+
+  //unsigned int texture_id_;

[cjgrant, 2017/04/19 16:24:52]

FTR, I don't think this should in any way be allocated by vr_shell_gl.cc.

+  //std::unique_ptr<UITexture> texture_;
+
+  DISALLOW_COPY_AND_ASSIGN(SecurityWarning);
+};
+
 static constexpr int kWarningTimeoutSeconds = 30;
 static constexpr float kWarningDistance = 0.7;
 static constexpr float kWarningAngleRadians = 16.3 * M_PI / 180.0;
 
 }  // namespace
 
 UiSceneManager::UiSceneManager(UiScene* scene)
     : scene_(scene), weak_ptr_factory_(this) {
   std::unique_ptr<UiElement> element;
 
@@ skipping 66 matching lines @@
   } else {
     security_warning_timer_.Stop();
   }
 }
 
 void UiSceneManager::OnSecurityWarningTimer() {
   transient_security_warning_->visible = false;
 }
 
 }  // namespace vr_shell