[ash-md] Updated the overflow shelf to change colors based on the wallpaper.

ash/shelf/shelf_view_unittest.cc

Index: ash/shelf/shelf_view_unittest.cc
diff --git a/ash/shelf/shelf_view_unittest.cc b/ash/shelf/shelf_view_unittest.cc
index 1d969cabbe815ceddc3f6a14f92b2d8bfbd2e6a5..1ea3a3f8e032d009ba77bf9f897b8c557f4ca140 100644
--- a/ash/shelf/shelf_view_unittest.cc
+++ b/ash/shelf/shelf_view_unittest.cc
@@ -35,6 +35,8 @@
 #include "ash/test/shell_test_api.h"
 #include "ash/test/test_shell_delegate.h"
 #include "ash/test/test_system_tray_delegate.h"
+#include "ash/test/wallpaper_controller_test_api.h"
+#include "ash/wallpaper/wallpaper_controller.h"
 #include "ash/wm_window.h"
 #include "base/i18n/rtl.h"
 #include "base/macros.h"
@@ -1580,6 +1582,19 @@ TEST_F(ShelfViewTest, OverflowBubbleSize) {
             test_for_overflow_view.GetPreferredSize().width());
 }
 
+TEST_F(ShelfViewTest, OverflowShelfColorIsDerivedFromWallpaper) {
+  test::WallpaperControllerTestApi wallpaper_test_api(
+      Shell::Get()->wallpaper_controller());
+  const SkColor opaque_expected_color =
+      wallpaper_test_api.ApplyColorProducingWallpaper();
+
+  AddButtonsUntilOverflow();
+  test_api_->ShowOverflowBubble();
+  OverflowBubbleView* bubble_view = test_api_->overflow_bubble()->bubble_view();
+
+  EXPECT_EQ(opaque_expected_color, SkColorSetA(bubble_view->color(), 255));
+}
+
 // Check the drag insertion bounds of scrolled overflow bubble.
 TEST_F(ShelfViewTest, CheckDragInsertBoundsOfScrolledOverflowBubble) {
   UpdateDisplay("400x300");