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

src/com/android/launcher3/Workspace.java

@@ -3166,11 +3166,8 @@ public class Workspace extends PagedView
             this.cellX = cellX;
             this.cellY = cellY;
 
-            DeviceProfile grid = mLauncher.getDeviceProfile();
             BubbleTextView cell = (BubbleTextView) layout.getChildAt(cellX, cellY);
-
-            bg.setup(getResources().getDisplayMetrics(), grid, null,
-                    cell.getMeasuredWidth(), cell.getPaddingTop());
+            bg.setup(mLauncher, null, cell.getMeasuredWidth(), cell.getPaddingTop());
 
             // The full preview background should appear behind the icon
             bg.isClipping = false;