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

chrome/browser/android/vr_shell/textures/exit_warning_texture.cc

 // 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.
 
 #include "chrome/browser/android/vr_shell/textures/exit_warning_texture.h"
 
 #include "cc/paint/skia_paint_canvas.h"
 #include "components/strings/grit/components_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/render_text.h"
 #include "ui/gfx/vector_icon_types.h"
 #include "ui/vector_icons/vector_icons.h"
 
 namespace vr_shell {
 
 namespace {
 
-const SkColor kBackgroundColor = 0xCC1A1A1A;
-const SkColor kForegroundColor = SK_ColorWHITE;
 constexpr float kBorderFactor = 0.045;
 constexpr float kFontSizeFactor = 0.048;
 constexpr float kTextWidthFactor = 1.0 - 3 * kBorderFactor;
 
 }  // namespace
 
 ExitWarningTexture::ExitWarningTexture() = default;
 
 ExitWarningTexture::~ExitWarningTexture() = default;
 
 void ExitWarningTexture::Draw(SkCanvas* sk_canvas,
                               const gfx::Size& texture_size) {
   cc::SkiaPaintCanvas paint_canvas(sk_canvas);
   gfx::Canvas gfx_canvas(&paint_canvas, 1.0f);
   gfx::Canvas* canvas = &gfx_canvas;
 
   size_.set_width(texture_size.width());
   SkPaint paint;
-  paint.setColor(kBackgroundColor);
+
+  paint.setColor(color_scheme().exit_warning_background);
   auto text =
       l10n_util::GetStringUTF16(IDS_PAGE_INFO_VR_BROWSER_UNSUPPORTED_MODE);
   gfx::FontList fonts;
   GetFontList(size_.width() * kFontSizeFactor, text, &fonts);
   gfx::Rect text_size(size_.width() * kTextWidthFactor, 0);
 
-  std::vector<std::unique_ptr<gfx::RenderText>> lines =
-      PrepareDrawStringRect(text, fonts, kForegroundColor, &text_size,
-                            kTextAlignmentCenter, kWrappingBehaviorWrap);
+  std::vector<std::unique_ptr<gfx::RenderText>> lines = PrepareDrawStringRect(
+      text, fonts, color_scheme().exit_warning_foreground, &text_size,
+      kTextAlignmentCenter, kWrappingBehaviorWrap);
 
   DCHECK_LE(text_size.height(),
             static_cast<int>((1.0 - 2 * kBorderFactor) * size_.width()));
   size_.set_height(size_.width() * 2 * kBorderFactor + text_size.height());
   float radius = size_.height() * kBorderFactor;
   sk_canvas->drawRoundRect(SkRect::MakeWH(size_.width(), size_.height()),
                            radius, radius, paint);
 
   canvas->Save();
   canvas->Translate(gfx::Vector2d(size_.width() * kBorderFactor,
                                   size_.width() * kBorderFactor));
   for (auto& render_text : lines)
     render_text->Draw(canvas);
   canvas->Restore();
 }
 
 gfx::Size ExitWarningTexture::GetPreferredTextureSize(int maximum_width) const {
   return gfx::Size(maximum_width, maximum_width);
 }
 
 gfx::SizeF ExitWarningTexture::GetDrawnSize() const {
   return size_;
 }
 
 }  // namespace vr_shell