Defining a dark theme for launcher

> Removing the code for LIGHT_STATUS_BAR as that will be controlled by the theme
> Updating icon cache to always use transparent background for low-res, as the
theme can change the bg color

Change-Id: Iab64ec29cab629ee515af22ec15b95d3f40a9df5
diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index b006453..61c9707 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -650,11 +650,11 @@
     /**
      * @return creates a new alpha mask bitmap out of an existing bitmap
      */
-    public static Bitmap convertToAlphaMask(Bitmap b, float applyAlpha) {
+    public static Bitmap convertToAlphaMask(Bitmap b, int applyAlpha) {
         Bitmap a = Bitmap.createBitmap(b.getWidth(), b.getHeight(), Bitmap.Config.ALPHA_8);
         Canvas c = new Canvas(a);
         Paint paint = new Paint();
-        paint.setAlpha((int) (255f * applyAlpha));
+        paint.setAlpha(applyAlpha);
         c.drawBitmap(b, 0f, 0f, paint);
         return a;
     }