[Extensions] Make a chrome.developerPrivate.getExtensionsInfo function

Make a new function, developerPrivate.getExtensionsInfo,
to handle generating and returning info about installed
extensions. We do this, instead of adjusting the current
(developerPrivate.getItemsInfo) to allow for breaking
changes - which lets us have consistent style and fewer
parameters.

BUG=461039

Review URL: https://codereview.chromium.org/989813002

Cr-Commit-Position: refs/heads/master@{#320355}
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index 52877c9..d40ec0de 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -1036,6 +1036,8 @@
   VIRTUALKEYBOARDPRIVATE_SETMODE,
   NETWORKINGPRIVATE_STARTACTIVATE,
   FILEMANAGERPRIVATE_GRANTACCESS,
+  DEVELOPERPRIVATE_GETEXTENSIONSINFO,
+  DEVELOPERPRIVATE_GETEXTENSIONINFO,
   // Last entry: Add new entries above and ensure to update
   // tools/metrics/histograms/histograms.xml.
   ENUM_BOUNDARY