Creating a custom drawable to customize shadow.

> Fixing DrapTargetBar set to visible (with alpha = 0) in the start
causing unnecessary draw

Bug: 37616877
Change-Id: Iaaff96099910f504f6e2f81c9376ddacde50ff6a

src/com/android/launcher3/InfoDropTarget.java

@@ -40,12 +40,10 @@ public class InfoDropTarget extends UninstallDropTarget {
     }
 
     @Override
-    protected void onFinishInflate() {
-        super.onFinishInflate();
+    protected void setupUi() {
         // Get the hover color
         mHoverColor = Themes.getColorAccent(getContext());
-
-        setDrawable(R.drawable.ic_info_launcher);
+        setDrawable(R.drawable.ic_info_shadow);
     }
 
     @Override