Add MD ink drop ripple to app list button

ash/shelf/shelf_button.cc

Index: ash/shelf/shelf_button.cc
diff --git a/ash/shelf/shelf_button.cc b/ash/shelf/shelf_button.cc
index 11707490b46bdc274fc6ef40d4250cd87fa589df..4319449397c037b7c423d44ccb684f123981a453 100644
--- a/ash/shelf/shelf_button.cc
+++ b/ash/shelf/shelf_button.cc
@@ -54,7 +54,6 @@ const int kIndicatorCanvasScale = 5;
 const int kInkDropSmallSize = 48;
 const int kInkDropLargeSize = 60;
 const int kInkDropLargeCornerRadius = 4;
-const SkColor kInkDropBaseColor = SK_ColorWHITE;
 
 // Paints an activity indicator on |canvas| whose |size| is specified in DIP.
 void PaintIndicatorOnCanvas(gfx::Canvas* canvas, const gfx::Size& size) {
@@ -260,8 +259,8 @@ ShelfButton::ShelfButton(InkDropButtonListener* listener, ShelfView* shelf_view)
       destroyed_flag_(nullptr) {
   SetFocusBehavior(FocusBehavior::ACCESSIBLE_ONLY);
   if (ash::MaterialDesignController::IsShelfMaterial()) {
-    SetHasInkDrop(true);
-    set_ink_drop_base_color(kInkDropBaseColor);
+    SetHasInkDrop(INK_DROP_WITH_GESTURE_HANDLING);
+    set_ink_drop_base_color(kShelfInkDropBaseColor);
     set_ink_drop_visible_opacity(kShelfInkDropVisibleOpacity);
   }