tp: add option to force sorting based on flush period

This unlocks a streaming-esque usecase where we don't try and sort the
whole trace in memory even if we're not writing into file.

Change-Id: I1e47b9e0285d9c44701e4b62eddb473e0a4e5ff5
diff --git a/CHANGELOG b/CHANGELOG
index 53d4285..dc95ad2 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,7 +2,9 @@
   Tracing service and probes:
     *
   Trace Processor:
-    *
+    * Added sorting mode to trace processor config to specify how trace
+      processor should sort events. The |force_full_sort| flag has been
+      deprecated (with replacement) and will be removed in the next version.
   UI:
     *
   SDK: