Add QoePingStore and QoePingItem

This is the first CL for the offline qoe reporting
feature. Refer to the design doc for full information.

Design doc: go/exoplayer-offline-qoe

PiperOrigin-RevId: 305459231

constants.gradle

@@ -21,7 +21,7 @@ project.ext {
     compileSdkVersion = 29
     dexmakerVersion = '2.21.0'
     junitVersion = '4.13-rc-2'
-    guavaVersion = '23.5-android'
+    guavaVersion = '28.2-android'
     mockitoVersion = '2.25.0'
     robolectricVersion = '4.3.1'
     checkerframeworkVersion = '2.5.0'

library/core/src/main/java/com/google/android/exoplayer2/database/VersionTable.java

@@ -40,6 +40,8 @@ public final class VersionTable {
   public static final int FEATURE_CACHE_CONTENT_METADATA = 1;
   /** Version of tables used for cache file metadata. */
   public static final int FEATURE_CACHE_FILE_METADATA = 2;
+  /** Version of tables used from external features. */
+  public static final int FEATURE_EXTERNAL = 1000;
 
   private static final String TABLE_NAME = DatabaseProvider.TABLE_PREFIX + "Versions";
 
@@ -67,7 +69,12 @@ public final class VersionTable {
 
   @Documented
   @Retention(RetentionPolicy.SOURCE)
-  @IntDef({FEATURE_OFFLINE, FEATURE_CACHE_CONTENT_METADATA, FEATURE_CACHE_FILE_METADATA})
+  @IntDef({
+    FEATURE_OFFLINE,
+    FEATURE_CACHE_CONTENT_METADATA,
+    FEATURE_CACHE_FILE_METADATA,
+    FEATURE_EXTERNAL
+  })
   private @interface Feature {}
 
   private VersionTable() {}