VrShell: implement insecure content warning display

chrome/browser/android/vr_shell/vr_shell_renderer.h

Index: chrome/browser/android/vr_shell/vr_shell_renderer.h
diff --git a/chrome/browser/android/vr_shell/vr_shell_renderer.h b/chrome/browser/android/vr_shell/vr_shell_renderer.h
index 05d6228842d339c2dde0a3ed5127c2c98fae6543..87661abf9a023706dec7cacebcce42236d28aab4 100644
--- a/chrome/browser/android/vr_shell/vr_shell_renderer.h
+++ b/chrome/browser/android/vr_shell/vr_shell_renderer.h
@@ -29,6 +29,8 @@ enum ShaderID {
   RETICLE_FRAGMENT_SHADER,
   LASER_VERTEX_SHADER,
   LASER_FRAGMENT_SHADER,
+  OVERLAY_ICON_VERTEX_SHADER,
+  OVERLAY_ICON_FRAGMENT_SHADER,
   SHADER_ID_MAX
 };
 
@@ -130,6 +132,41 @@ class LaserRenderer : public BaseRenderer {
   DISALLOW_COPY_AND_ASSIGN(LaserRenderer);
 };
 
+// Renders icons as static overlays.
+enum OverlayIconID {
+  ICON_INSECURE_PERMANENT = 0,
+  ICON_INSECURE_TRANSIENT,
+  ICON_ID_MAX
+};
+
+class OverlayIconRenderer {
+ public:
+  OverlayIconRenderer();
+  ~OverlayIconRenderer();
+
+  void Draw(const gvr::Mat4f& combined_matrix, int icon_num);
+
+ private:
+  static constexpr size_t VERTEX_STRIDE = sizeof(float) * 4;
+  static constexpr size_t POSITION_ELEMENTS = 2;
+  static constexpr size_t TEXCOORD_ELEMENTS = 2;
+  static constexpr size_t POSITION_OFFSET = 0;
+  static constexpr size_t TEXCOORD_OFFSET = sizeof(float) * 2;
+
+  GLuint program_handle_;
+  GLuint tex_uniform_handle_;
+  GLuint texture_data_handles_[ICON_ID_MAX];
+  GLuint src_rect_uniform_handle_;
+  GLuint position_handle_;
+  GLuint texcoord_handle_;
+  GLuint vertex_buffer_;
+  GLuint combined_matrix_handle_;
+
+  gvr::Rectf bounds_;
+
+  DISALLOW_COPY_AND_ASSIGN(OverlayIconRenderer);
+};
+
 class VrShellRenderer {
  public:
   VrShellRenderer();
@@ -151,11 +188,16 @@ class VrShellRenderer {
     return laser_renderer_.get();
   }
 
+  OverlayIconRenderer* GetOverlayIconRenderer() {
+    return overlay_icon_renderer_.get();
+  }
+
  private:
   std::unique_ptr<TexturedQuadRenderer> textured_quad_renderer_;
   std::unique_ptr<WebVrRenderer> webvr_renderer_;
   std::unique_ptr<ReticleRenderer> reticle_renderer_;
   std::unique_ptr<LaserRenderer> laser_renderer_;
+  std::unique_ptr<OverlayIconRenderer> overlay_icon_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShellRenderer);
 };