Don't plot usage data beyond current date.

- the new data usage api returns buckets for future date with 0 usage.
When we plot the data usage chart, need to check the bucket date to make
sure we only plot points up to the current date.

Change-Id: I50e161ca9cdbb30c8fda8f6cdd24c993b546ad0d
Fixes: 120490567
Test: make RunSettingsRoboTests

src/com/android/settings/datausage/ChartDataUsagePreference.java

@@ -95,9 +95,13 @@ public class ChartDataUsagePreference extends Preference {
         final SparseIntArray points = new SparseIntArray();
         points.put(0, 0);
 
+        final long now = System.currentTimeMillis();
         long totalData = 0;
         for (NetworkCycleData data : usageSummary) {
             final long startTime = data.getStartTime();
+            if (startTime > now) {
+                break;
+            }
             final long endTime = data.getEndTime();
 
             // increment by current bucket total