Initial implementation of chrome.browser.openTab.

BUG=358315

Review URL: https://codereview.chromium.org/245933002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@267697 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/extensions/browser/extension_function_histogram_value.h b/extensions/browser/extension_function_histogram_value.h
index 90f8d7f..10665898c 100644
--- a/extensions/browser/extension_function_histogram_value.h
+++ b/extensions/browser/extension_function_histogram_value.h
@@ -810,6 +810,7 @@
   SHELL_CREATEWINDOW,
   FILESYSTEMPROVIDERINTERNAL_GETMETADATAREQUESTEDSUCCESS,
   FILESYSTEMPROVIDERINTERNAL_GETMETADATAREQUESTEDERROR,
+  BROWSER_OPENTAB,
   // Last entry: Add new entries above and ensure to update
   // tools/metrics/histograms/histograms/histograms.xml.
   ENUM_BOUNDARY