API to wait for launcher state change.

This also adds api to activate accelerator, which is used
to change the launcher state.

Bug: 1001728
Test: covered by unittests
Change-Id: I9e545a4ab5a646a5260f59b821e3229e87ad5466
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869991
Commit-Queue: Mitsuru Oshima <[email protected]>
Reviewed-by: Steven Bennetts <[email protected]>
Reviewed-by: Jun Mukai <[email protected]>
Cr-Commit-Position: refs/heads/master@{#711556}
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index cc3dc85..0534d40 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -1459,6 +1459,8 @@
   AUTOTESTPRIVATE_CLOSEAPPWINDOW = 1396,
   AUTOTESTPRIVATE_REFRESHENTERPRISEPOLICIES = 1397,
   AUTOTESTPRIVATE_INSTALLPWAFORCURRENTURL = 1398,
+  AUTOTESTPRIVATE_ACTIVATEACCELERATOR = 1399,
+  AUTOTESTPRIVATE_WAITFORLAUNCHERSTATE = 1400,
   // Last entry: Add new entries above, then run:
   // python tools/metrics/histograms/update_extension_histograms.py
   ENUM_BOUNDARY