Updating the widget tray

-> adding dark panel / associated visual updates
-> cleaning up the sizing / padding / to match all apps
-> fixing a couple things from previous CL
-> (removed Context#getDrawable() calls, L-only)

Change-Id: Ia65a6eb704b35f74e7305be9334c27971b22235a

src/com/android/launcher3/PagedViewGridLayout.java

@@ -56,18 +56,6 @@ public class PagedViewGridLayout extends GridLayout implements Page {
         }
     }
 
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        // PagedView currently has issues with different-sized pages since it calculates the
-        // offset of each page to scroll to before it updates the actual size of each page
-        // (which can change depending on the content if the contents aren't a fixed size).
-        // We work around this by having a minimum size on each widget page).
-        int widthSpecSize = Math.min(getSuggestedMinimumWidth(),
-                MeasureSpec.getSize(widthMeasureSpec));
-        int widthSpecMode = MeasureSpec.EXACTLY;
-        super.onMeasure(MeasureSpec.makeMeasureSpec(widthSpecSize, widthSpecMode),
-                heightMeasureSpec);
-    }
-
     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();