Parse DASH manifest's publish time.

Parse DASH manifest's publishTime node as defined by ISO/IEC 23009-1:2014,
section 5.3.1.2.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=176525922

library/dash/src/androidTest/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestTest.java

@@ -136,6 +136,7 @@ public class DashManifestTest extends TestCase {
     assertEquals(expected.minUpdatePeriodMs, actual.minUpdatePeriodMs);
     assertEquals(expected.timeShiftBufferDepthMs, actual.timeShiftBufferDepthMs);
     assertEquals(expected.suggestedPresentationDelayMs, actual.suggestedPresentationDelayMs);
+    assertEquals(expected.publishTimeMs, actual.publishTimeMs);
     assertEquals(expected.utcTiming, actual.utcTiming);
     assertEquals(expected.location, actual.location);
     assertEquals(expected.getPeriodCount(), actual.getPeriodCount());
@@ -179,7 +180,7 @@ public class DashManifestTest extends TestCase {
   }
 
   private static DashManifest newDashManifest(int duration, Period... periods) {
-    return new DashManifest(0, duration, 1, false, 2, 3, 4, DUMMY_UTC_TIMING, Uri.EMPTY,
+    return new DashManifest(0, duration, 1, false, 2, 3, 4, 12345, DUMMY_UTC_TIMING, Uri.EMPTY,
         Arrays.asList(periods));
   }
 

library/dash/src/main/java/com/google/android/exoplayer2/source/dash/manifest/DashManifest.java

@@ -67,6 +67,12 @@ public class DashManifest {
    */
   public final long suggestedPresentationDelayMs;
 
+  /**
+   * The {@code publishTime} value in milliseconds since epoch, or {@link C#TIME_UNSET} if
+   * not present.
+   */
+  public final long publishTimeMs;
+
   /**
    * The {@link UtcTimingElement}, or null if not present. Defined in DVB A168:7/2016, Section
    * 4.7.2.
@@ -82,8 +88,8 @@ public class DashManifest {
 
   public DashManifest(long availabilityStartTimeMs, long durationMs, long minBufferTimeMs,
       boolean dynamic, long minUpdatePeriodMs, long timeShiftBufferDepthMs,
-      long suggestedPresentationDelayMs, UtcTimingElement utcTiming, Uri location,
+      long suggestedPresentationDelayMs, long publishTimeMs, UtcTimingElement utcTiming,
-      List<Period> periods) {
+      Uri location, List<Period> periods) {
     this.availabilityStartTimeMs = availabilityStartTimeMs;
     this.durationMs = durationMs;
     this.minBufferTimeMs = minBufferTimeMs;
@@ -91,6 +97,7 @@ public class DashManifest {
     this.minUpdatePeriodMs = minUpdatePeriodMs;
     this.timeShiftBufferDepthMs = timeShiftBufferDepthMs;
     this.suggestedPresentationDelayMs = suggestedPresentationDelayMs;
+    this.publishTimeMs = publishTimeMs;
     this.utcTiming = utcTiming;
     this.location = location;
     this.periods = periods == null ? Collections.<Period>emptyList() : periods;
@@ -147,8 +154,8 @@ public class DashManifest {
     }
     long newDuration = durationMs != C.TIME_UNSET ? durationMs - shiftMs : C.TIME_UNSET;
     return new DashManifest(availabilityStartTimeMs, newDuration, minBufferTimeMs, dynamic,
-        minUpdatePeriodMs, timeShiftBufferDepthMs, suggestedPresentationDelayMs, utcTiming,
+        minUpdatePeriodMs, timeShiftBufferDepthMs, suggestedPresentationDelayMs, publishTimeMs,
-        location, copyPeriods);
+        utcTiming, location, copyPeriods);
   }
 
   private static ArrayList<AdaptationSet> copyAdaptationSets(

library/dash/src/main/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestParser.java

@@ -119,6 +119,7 @@ public class DashManifestParser extends DefaultHandler
         ? parseDuration(xpp, "timeShiftBufferDepth", C.TIME_UNSET) : C.TIME_UNSET;
     long suggestedPresentationDelayMs = dynamic
         ? parseDuration(xpp, "suggestedPresentationDelay", C.TIME_UNSET) : C.TIME_UNSET;
+    long publishTimeMs = parseDateTime(xpp, "publishTime", C.TIME_UNSET);
     UtcTimingElement utcTiming = null;
     Uri location = null;
 
@@ -171,17 +172,17 @@ public class DashManifestParser extends DefaultHandler
     }
 
     return buildMediaPresentationDescription(availabilityStartTime, durationMs, minBufferTimeMs,
-        dynamic, minUpdateTimeMs, timeShiftBufferDepthMs, suggestedPresentationDelayMs, utcTiming,
+        dynamic, minUpdateTimeMs, timeShiftBufferDepthMs, suggestedPresentationDelayMs,
-        location, periods);
+        publishTimeMs, utcTiming, location, periods);
   }
 
   protected DashManifest buildMediaPresentationDescription(long availabilityStartTime,
       long durationMs, long minBufferTimeMs, boolean dynamic, long minUpdateTimeMs,
-      long timeShiftBufferDepthMs, long suggestedPresentationDelayMs, UtcTimingElement utcTiming,
+      long timeShiftBufferDepthMs, long suggestedPresentationDelayMs, long publishTimeMs,
-      Uri location, List<Period> periods) {
+      UtcTimingElement utcTiming, Uri location, List<Period> periods) {
     return new DashManifest(availabilityStartTime, durationMs, minBufferTimeMs,
-        dynamic, minUpdateTimeMs, timeShiftBufferDepthMs, suggestedPresentationDelayMs, utcTiming,
+        dynamic, minUpdateTimeMs, timeShiftBufferDepthMs, suggestedPresentationDelayMs,
-        location, periods);
+        publishTimeMs, utcTiming, location, periods);
   }
 
   protected UtcTimingElement parseUtcTiming(XmlPullParser xpp) {