Add additional fields to ClientData for actions

PiperOrigin-RevId: 310157269
Change-Id: Iaaf5d547838d85752ce72e8c11524244fe82b760

src/main/proto/search/now/wire/feed/feed_action.proto

diff --git a/src/main/proto/search/now/wire/feed/feed_action.proto b/src/main/proto/search/now/wire/feed/feed_action.proto
index 51258dd..c9fbcd0 100644
--- a/src/main/proto/search/now/wire/feed/feed_action.proto
+++ b/src/main/proto/search/now/wire/feed/feed_action.proto
@@ -42,5 +42,14 @@
   message ClientData {
     // When the action was recorded on the client
     optional int64 timestamp_seconds = 1;
+
+    // A monotonically-increasing sequence number that increments per
+    // user + device. Used in experiments to measure action loss between client
+    // and server.
+    optional int64 sequence_number = 2;
+
+    // The duration for the action in milliseconds. In case of view actions this
+    // is the duration for which the content is considered "viewed".
+    optional int64 duration_ms = 3;
   }
 }