Update overview button color for light mode.

Bug: 1110757
Change-Id: I415313e4f1b9279ac4df68243a6b65f12055c092
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378801Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Yulun Wu <yulunwu@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Commit-Queue: Yulun Wu <yulunwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802458}

ash/system/overview/overview_button_tray.cc

@@ -10,6 +10,7 @@
 #include "ash/session/session_controller_impl.h"
 #include "ash/shell.h"
 #include "ash/strings/grit/ash_strings.h"
+#include "ash/style/ash_color_provider.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_container.h"
 #include "ash/wm/mru_window_tracker.h"
@@ -36,7 +37,10 @@ OverviewButtonTray::OverviewButtonTray(Shelf* shelf)
       icon_(new views::ImageView()),
       scoped_session_observer_(this) {
   gfx::ImageSkia image = gfx::CreateVectorIcon(
-      kShelfOverviewIcon, ShelfConfig::Get()->shelf_icon_color());
+      kShelfOverviewIcon,
+      AshColorProvider::Get()->GetContentLayerColor(
+          AshColorProvider::ContentLayerType::kButtonIconColor,
+          AshColorProvider::AshColorMode::kDark));
   icon_->SetImage(image);
   const int vertical_padding = (kTrayItemSize - image.height()) / 2;
   const int horizontal_padding = (kTrayItemSize - image.width()) / 2;