Data usage app icons and details, chart labels.

Add app icons into both summary list and details pane. Also show list
of all applications merged under a UID. Draw dates on chart axis, and
avoid flashing policy sweeps when switching networks in detail mode.

Bug: 5087283, 5038812
Change-Id: I1dcd03ca85b517f8726452af8a46b4be9b3d20f1

src/com/android/settings/widget/DataUsageChartView.java

@@ -343,6 +343,7 @@ public class DataUsageChartView extends ChartView {
      */
     public void setVisibleRange(long visibleStart, long visibleEnd) {
         mHoriz.setBounds(visibleStart, visibleEnd);
+        mGrid.setBounds(visibleStart, visibleEnd);
 
         final long validStart = Math.max(visibleStart, getStatsStart());
         final long validEnd = Math.min(visibleEnd, getStatsEnd());