VR: Split off UI code into a library to ease future unit testing.

chrome/browser/android/vr_shell/vr_shell_renderer.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_RENDERER_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_RENDERER_H_
 
 #include <memory>
 #include <queue>
 #include <vector>
 
 #include "base/macros.h"
+#include "chrome/browser/android/vr_shell/ui_element_renderer.h"
 #include "chrome/browser/android/vr_shell/vr_controller_model.h"
 #include "device/vr/vr_types.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace vr_shell {
 
 // TODO(tiborg): set background color through JS API.
 constexpr float kFogBrightness = 0.57f;
 
 enum ShaderID {
@@ skipping 241 matching lines @@
   GLuint scene_radius_handle_;
   GLuint center_color_handle_;
   GLuint edge_color_handle_;
   GLuint grid_color_handle_;
   GLuint opacity_handle_;
   GLuint lines_count_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(GradientGridRenderer);
 };
 
-class VrShellRenderer {
+class VrShellRenderer : public UiElementRenderer {
  public:
   VrShellRenderer();
-  ~VrShellRenderer();
+  ~VrShellRenderer() override;
 
+  // UiElementRenderer interface (exposed to UI elements).
+  void DrawTexturedQuad(int texture_data_handle,
+                        const vr::Mat4f& view_proj_matrix,
+                        const gfx::RectF& copy_rect,
+                        float opacity) override;
+  void DrawGradientQuad(const vr::Mat4f& view_proj_matrix,
+                        const SkColor edge_color,
+                        const SkColor center_color,
+                        float opacity) override;
+
+  // VrShell's internal GL rendering API.
   ExternalTexturedQuadRenderer* GetExternalTexturedQuadRenderer();
   TexturedQuadRenderer* GetTexturedQuadRenderer();
   WebVrRenderer* GetWebVrRenderer();
   ReticleRenderer* GetReticleRenderer();
   LaserRenderer* GetLaserRenderer();
   ControllerRenderer* GetControllerRenderer();
   GradientQuadRenderer* GetGradientQuadRenderer();
   GradientGridRenderer* GetGradientGridRenderer();
   void Flush();
 
  private:
   std::unique_ptr<ExternalTexturedQuadRenderer>
       external_textured_quad_renderer_;
   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<ControllerRenderer> controller_renderer_;
   std::unique_ptr<GradientQuadRenderer> gradient_quad_renderer_;
   std::unique_ptr<GradientGridRenderer> gradient_grid_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShellRenderer);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_RENDERER_H_