[VrShell] Centralize color handling and enable close button on fullscreen

chrome/browser/android/vr_shell/textures/ui_texture.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_UI_TEXTURE_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_UI_TEXTURE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 41 matching lines @@
 
   enum WrappingBehavior {
     kWrappingBehaviorWrap,
     kWrappingBehaviorNoWrap,
   };
 
   virtual void Draw(SkCanvas* canvas, const gfx::Size& texture_size) = 0;
 
   virtual void OnSetMode();
   ColorScheme::Mode mode() const { return mode_; }
+  const ColorScheme& color_scheme() const;
 
   // Prepares a set of RenderText objects with the given color and fonts.
   // Attempts to fit the text within the provided size. |flags| specifies how
   // the text should be rendered. If multiline is requested and provided height
   // is 0, it will be set to the minimum needed to fit the whole text. If
   // multiline is not requested and provided width is 0, it will be set to the
   // minimum needed to fit the whole text.
   static std::vector<std::unique_ptr<gfx::RenderText>> PrepareDrawStringRect(
       const base::string16& text,
       const gfx::FontList& font_list,
@@ skipping 20 matching lines @@
  private:
   bool dirty_ = true;
   ColorScheme::Mode mode_ = ColorScheme::kModeNormal;
 
   DISALLOW_COPY_AND_ASSIGN(UiTexture);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_TEXTURES_UI_TEXTURE_H_