Bump package:usage.

Most of these are from a single PR that did not get squashed.

Running `git log --format=%C(auto) %h %s e0780cd8b2f8af69a28dc52678ffe8492da27d06..016dd302b494e4ff70a7850957ec895eced9d220` in third_party/pkg/usage ✓
 016dd30 Prepare release (#160)
 076c653 Merge pull request #152 from sigurdm/batching
 1d6b343 Remove debug print
 c073fb7 Use correct limit for bytes
 1d89875 Send batch early if full
 2896a85 Update README.md
 da20fab Delete travis.sh
 7c351a3 Merge
 0424091 Update build.yaml (#159)
 4f2a050 Use a Duration for batching delay
 aa3f3ce address review
 318ebe5 Fix
 71ddec1 Send remaining hits on waitForLastPing
 1c895a7 Parametrize client-id in test
 0ae7733 Fix pubspec
 2255b3d Merge remote-tracking branch 'origin/master' into batching
 14d3702 Merge remote-tracking branch 'origin/master' into batching
 1c3393d Handle batching implicit waiting for a 'batchDelay' future
 219b764 TODO about size of payloads
 aaee6d9 Fix AnalyticsMock
 a8ec5b4 Remove mockito as dep - didn't use it
 e26fcce Allow batching of hits

Change-Id: I801c0d9114fb90e1dc94c3e2552c1cd90a8f0c18
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/213349
Reviewed-by: Jonas Jensen <jonasfj@google.com>
Commit-Queue: Sigurd Meldgaard <sigurdm@google.com>

DEPS

@@ -163,7 +163,7 @@ vars = {
   "test_reflective_loader_rev": "fcfce37666672edac849d2af6dffc0f8df236a94",
   "test_rev": "099dcc4d052a30c6921489cfbefa1c8531d12975",
   "typed_data_rev": "29ce5a92b03326d0b8035916ac04f528874994bd",
-  "usage_rev": "e0780cd8b2f8af69a28dc52678ffe8492da27d06",
+  "usage_rev": "016dd302b494e4ff70a7850957ec895eced9d220",
   "vector_math_rev": "0c9f5d68c047813a6dcdeb88ba7a42daddf25025",
   "watcher_rev": "3924194385fb215cef483193ed2879a618a3d69c",
   "webdriver_rev": "ff5ccb1522edf4bed578ead4d65e0cbc1f2c4f02",