Add UMA metrics for pop-up blocked page action on desktop

chrome/browser/content_settings/chrome_content_settings_utils.h

Index: chrome/browser/content_settings/chrome_content_settings_utils.h
diff --git a/chrome/browser/content_settings/chrome_content_settings_utils.h b/chrome/browser/content_settings/chrome_content_settings_utils.h
index a787e7ab3802f65a36c14983d6abfadd31d6c934..df9f36291a41acba50b0d15a0bd38045e5db5bd9 100644
--- a/chrome/browser/content_settings/chrome_content_settings_utils.h
+++ b/chrome/browser/content_settings/chrome_content_settings_utils.h
@@ -38,6 +38,20 @@ enum PluginsAction {
 
 void RecordPluginsAction(PluginsAction action);
 
+// The different actions that a user can perform on the pop-up blocked page
+// action in the omnibox, The enum values back an UMA histogram, so they must be

[Nico, 2017/01/03 14:34:07]

don't capitalize after ,

Also, Use the same sentence structure as for the other enums in this file, i.e.
"UMA histogram for actions that a cuser can perform on the pop-up blocked page
action in the omnibox. The enum values correspond to histogram entries, so do
not remove any existing values." instead of what you have

+// treated as append-only.
+enum PopupsAction {
+  POPUPS_ACTION_DISPLAYED_BLOCKED_ICON_IN_OMNIBOX = 0,
+  POPUPS_ACTION_DISPLAYED_BUBBLE,
+  POPUPS_ACTION_SELECTED_ALWAYS_ALLOW_POPUPS_FROM,
+  POPUPS_ACTION_CLICKED_LIST_ITEM_CLICKED,
+  POPUPS_ACTION_CLICKED_MANAGE_POPUPS_BLOCKING,
+  POPUPS_ACTION_COUNT
+};
+
+void RecordPopupsAction(PopupsAction action);
+
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CHROME_CONTENT_SETTINGS_UTILS_H_