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

chrome/browser/android/vr_shell/ui_scene_manager.cc

Index: chrome/browser/android/vr_shell/ui_scene_manager.cc
diff --git a/chrome/browser/android/vr_shell/ui_scene_manager.cc b/chrome/browser/android/vr_shell/ui_scene_manager.cc
index dfd3fa6e8f07eca712bdc435abe97e3976aec987..b92d8dc20396215e866101209840174f2c13a461 100644
--- a/chrome/browser/android/vr_shell/ui_scene_manager.cc
+++ b/chrome/browser/android/vr_shell/ui_scene_manager.cc
@@ -5,6 +5,8 @@
 #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"
 
@@ -12,6 +14,31 @@ 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;