overview: Use higher quality resize on overview icons.

This makes icons look better.

Test: manual
Bug: 817877
Change-Id: I48f11379a6045b6f423e360fb3947233575d3b32
Reviewed-on: https://chromium-review.googlesource.com/953971Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541849}

ash/wm/overview/window_selector_item.cc

@@ -1116,7 +1116,7 @@ void WindowSelectorItem::CreateWindowLabel(const base::string16& title) {
     if (icon && !icon->size().IsEmpty()) {
       image_view = new views::ImageView();
       image_view->SetImage(gfx::ImageSkiaOperations::CreateResizedImage(
-          *icon, skia::ImageOperations::RESIZE_GOOD, kIconSize));
+          *icon, skia::ImageOperations::RESIZE_BEST, kIconSize));
       image_view->SetSize(kIconSize);
     }
   }