Add UMA metrics and histograms for locally managed users.

chrome/browser/managed_mode/managed_mode.h

Index: chrome/browser/managed_mode/managed_mode.h
===================================================================
--- chrome/browser/managed_mode/managed_mode.h	(revision 177135)
+++ chrome/browser/managed_mode/managed_mode.h	(working copy)
@@ -13,6 +13,7 @@
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
+#include "base/time.h"
 #include "chrome/browser/extensions/management_policy.h"
 #include "chrome/browser/ui/browser_list_observer.h"
 #include "content/public/browser/notification_observer.h"
@@ -28,7 +29,7 @@
 class PrefServiceSyncable;
 class Profile;
 
-namespace policy{
+namespace policy {
 class URLBlacklist;
 }
 
@@ -94,6 +95,9 @@
   // Returns the profile blacklist.
   static scoped_ptr<base::ListValue> GetBlacklist();
 
+  // Returns the URL's category (ID number).
+  static int GetCategory(const GURL& url);
+
   // ExtensionManagementPolicy::Provider implementation:
   virtual std::string GetDebugPolicyProviderName() const OVERRIDE;
   virtual bool UserMayLoad(const extensions::Extension* extension,
@@ -131,6 +135,12 @@
 
   virtual void InitImpl(Profile* profile);
 
+  // Collect statistics about URLs and categories in the history database.
+  // The |description| will be used in the name of the UMA histogram.
+  void CollectDetailedHistoryMetrics(Profile* profile,
+                                     base::Time start_time,
+                                     std::string description);
+
   // Internal implementation for ExtensionManagementPolicy::Delegate methods.
   // If |error| is not NULL, it will be filled with an error message if the
   // requested extension action (install, modify status, etc.) is not permitted.
@@ -141,6 +151,8 @@
   const ManagedModeURLFilter* GetURLFilterForIOThreadImpl();
   const ManagedModeURLFilter* GetURLFilterForUIThreadImpl();
 
+  int GetCategoryImpl(const GURL& url);
+
   void FinalizeEnter(bool result);
 
   // Platform-specific methods that confirm whether we can enter or leave