Deprecate the isForeground value because we don't care about it

Test: none
Bug: 135488406
Change-Id: I93630fe11cba87482d79aa57fdddfe341cedd0f8
diff --git a/cmds/statsd/src/atoms.proto b/cmds/statsd/src/atoms.proto
index db1cb4b..82f0815 100644
--- a/cmds/statsd/src/atoms.proto
+++ b/cmds/statsd/src/atoms.proto
@@ -5883,7 +5883,8 @@
     optional bool is_ongoing = 10;
 
     // Whether the bubble is produced by an app running in foreground.
-    optional bool is_foreground = 11;
+    // This is deprecated and the value should be ignored.
+    optional bool is_foreground = 11 [deprecated = true];
 }
 
 /**