Smaller assets for phantom windows when using --ash-enable-alternate-caption-button

ash/wm/workspace/phantom_window_controller.cc

Index: ash/wm/workspace/phantom_window_controller.cc
diff --git a/ash/wm/workspace/phantom_window_controller.cc b/ash/wm/workspace/phantom_window_controller.cc
index 67706f228c77ca8e290b8e58069df881b92332bc..4608f4d8a3a980d30f8b8a3e91e41a6111ca56e8 100644
--- a/ash/wm/workspace/phantom_window_controller.cc
+++ b/ash/wm/workspace/phantom_window_controller.cc
@@ -37,7 +37,7 @@ const float kAlternateCaptionButtonStyleAnimationInitialBoundsRatio = 0.85f;
 // The amount of pixels that the phantom window's shadow should extend past
 // the bounds passed into Show(). There is no shadow when not using the
 // alternate caption button style.
-const int kShadowThickness = 60;
+const int kShadowThickness = 15;
 
 // Converts the bounds of a phantom window without a shadow to those of a
 // phantom window with a shadow.