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

chrome/browser/android/vr_shell/ui_elements/ui_element.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_UI_ELEMENTS_UI_ELEMENT_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_UI_ELEMENT_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "chrome/browser/android/vr_shell/color_scheme.h"
 #include "chrome/browser/android/vr_shell/ui_elements/ui_element_debug_id.h"
 #include "device/vr/vr_types.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 namespace base {
 class TimeTicks;
 }
 
 namespace vr_shell {
 
 class Animation;
-class VrShellRenderer;
+class UiElementRenderer;
 
 enum XAnchoring {
   XNONE = 0,
   XLEFT,
   XRIGHT,
 };
 
 enum YAnchoring {
   YNONE = 0,
   YTOP,
@@ skipping 64 matching lines @@
   virtual void OnBeginFrame(const base::TimeTicks& begin_frame_time);
 
   void Animate(const base::TimeTicks& time);
 
   // Indicates whether the element should be visually rendered.
   bool IsVisible() const;
 
   // Indicates whether the element should be tested for cursor input.
   bool IsHitTestable() const;
 
-  virtual void Render(VrShellRenderer* renderer,
+  virtual void Render(UiElementRenderer* renderer,
                       vr::Mat4f view_proj_matrix) const;
 
   virtual void Initialize();
 
   // Controller interaction methods.
   virtual void OnHoverEnter(const gfx::PointF& position);
   virtual void OnHoverLeave();
   virtual void OnMove(const gfx::PointF& position);
   virtual void OnButtonDown(const gfx::PointF& position);
   virtual void OnButtonUp(const gfx::PointF& position);
@@ skipping 203 matching lines @@
   Transform transform_;
 
   ColorScheme::Mode mode_ = ColorScheme::kModeNormal;
 
   DISALLOW_COPY_AND_ASSIGN(UiElement);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_UI_ELEMENTS_UI_ELEMENT_H_