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

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

Index: chrome/browser/android/vr_shell/textures/exit_warning_texture.cc
diff --git a/chrome/browser/android/vr_shell/textures/exit_warning_texture.cc b/chrome/browser/android/vr_shell/textures/exit_warning_texture.cc
index f3bdf5ab8e630cecc06cfcb5329e8c7d74209ff4..b74a3302e4428bab8a7c550903ada3291a1744c7 100644
--- a/chrome/browser/android/vr_shell/textures/exit_warning_texture.cc
+++ b/chrome/browser/android/vr_shell/textures/exit_warning_texture.cc
@@ -20,8 +20,6 @@ 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;
@@ -40,16 +38,17 @@ void ExitWarningTexture::Draw(SkCanvas* sk_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()));