Omnibox UMA: Record How People Enter Keyword Mode

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm

Index: chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
index 3e1140fd3c8477c429bf8a1dc67444f913b6a403..0291b31b23d9909671097d01204850a98e188b91 100644
--- a/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
+++ b/chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.mm
@@ -731,7 +731,7 @@ bool OmniboxViewMac::OnDoCommandBySelector(SEL cmd) {
   if ((cmd == @selector(insertTab:) ||
       cmd == @selector(insertTabIgnoringFieldEditor:)) &&
       model()->is_keyword_hint()) {
-    return model()->AcceptKeyword();
+    return model()->AcceptKeyword(ENTERED_KEYWORD_MODE_VIA_TAB);
   }
 
   // |-noop:| is sent when the user presses Cmd+Return. Override the no-op