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

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

Index: chrome/browser/android/vr_shell/textures/close_button_texture.cc
diff --git a/chrome/browser/android/vr_shell/textures/close_button_texture.cc b/chrome/browser/android/vr_shell/textures/close_button_texture.cc
index 23bee39e6f9c9680e0ce6dc3bca6f3adf7427d67..7de21dcfeab9044f6b5c53a59215a5bfdfb7a467 100644
--- a/chrome/browser/android/vr_shell/textures/close_button_texture.cc
+++ b/chrome/browser/android/vr_shell/textures/close_button_texture.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/android/vr_shell/textures/close_button_texture.h"
 
 #include "cc/paint/skia_paint_canvas.h"
+#include "chrome/browser/android/vr_shell/color_scheme.h"
 #include "chrome/browser/android/vr_shell/ui_elements/button.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/geometry/point_f.h"
@@ -18,11 +19,7 @@ namespace vr_shell {
 
 namespace {
 
-const SkColor kBackgroundColor = SK_ColorWHITE;
-const SkColor kBackgroundColorHover = 0xFFE5E5E5;
-const SkColor kBackgroundColorDown = 0xFFD5D5D5;
-const SkColor kForegroundColor = 0xFF444444;
-constexpr float kIconScaleFactor = 0.75;
+constexpr float kIconScaleFactor = 0.5;
 
 }  // namespace
 
@@ -41,8 +38,9 @@ void CloseButtonTexture::Draw(SkCanvas* sk_canvas,
   size_.set_width(texture_size.width());
 
   cc::PaintFlags flags;
-  SkColor color = hovered() ? kBackgroundColorHover : kBackgroundColor;
-  color = pressed() ? kBackgroundColorDown : color;
+  SkColor color = hovered() ? color_scheme().element_background_hover
+                            : color_scheme().element_background;
+  color = pressed() ? color_scheme().element_background_down : color;
   flags.setColor(color);
   canvas->DrawCircle(gfx::PointF(size_.width() / 2, size_.height() / 2),
                      size_.width() / 2, flags);
@@ -51,7 +49,7 @@ void CloseButtonTexture::Draw(SkCanvas* sk_canvas,
   canvas->Translate(gfx::Vector2d(size_.height() * (1 - kIconScaleFactor) / 2,
                                   size_.height() * (1 - kIconScaleFactor) / 2));
   PaintVectorIcon(canvas, ui::kCloseIcon, size_.height() * kIconScaleFactor,
-                  kForegroundColor);
+                  color_scheme().element_foreground);
   canvas->Restore();
 }