Additional metrics for disabled extensions and content verification

extensions/common/extension.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_COMMON_EXTENSION_H_
 #define EXTENSIONS_COMMON_EXTENSION_H_
 
 #include <algorithm>
 #include <iosfwd>
 #include <map>
@@ skipping 59 matching lines @@
 
   // Used to record the reason an extension was disabled.
   enum DeprecatedDisableReason {
     DEPRECATED_DISABLE_UNKNOWN,
     DEPRECATED_DISABLE_USER_ACTION,
     DEPRECATED_DISABLE_PERMISSIONS_INCREASE,
     DEPRECATED_DISABLE_RELOAD,
     DEPRECATED_DISABLE_LAST,  // Not used.
   };
 
+  // Reasons an extension may be disabled. These are used in histograms, so do
+  // not remove/reorder entries - only add at the end just before
+  // DISABLE_REASON_LAST (and update the shift value for it). Also remember to
+  // update the enum listing in tools/metrics/histograms.xml.
   enum DisableReason {
     DISABLE_NONE = 0,
     DISABLE_USER_ACTION = 1 << 0,
     DISABLE_PERMISSIONS_INCREASE = 1 << 1,
     DISABLE_RELOAD = 1 << 2,
     DISABLE_UNSUPPORTED_REQUIREMENT = 1 << 3,
     DISABLE_SIDELOAD_WIPEOUT = 1 << 4,
     DISABLE_UNKNOWN_FROM_SYNC = 1 << 5,
     // DISABLE_PERMISSIONS_CONSENT = 1 << 6,  // Deprecated.
     // DISABLE_KNOWN_DISABLED = 1 << 7,  // Deprecated.
     DISABLE_NOT_VERIFIED = 1 << 8,  // Disabled because we could not verify
                                     // the install.
     DISABLE_GREYLIST = 1 << 9,
     DISABLE_CORRUPTED = 1 << 10,
-    DISABLE_REMOTE_INSTALL = 1 << 11
+    DISABLE_REMOTE_INSTALL = 1 << 11,
+    DISABLE_REASON_LAST = 1 << 12,  // This should always be the last value
   };
 
   // A base class for parsed manifest data that APIs want to store on
   // the extension. Related to base::SupportsUserData, but with an immutable
   // thread-safe interface to match Extension.
   struct ManifestData {
     virtual ~ManifestData() {}
   };
 
   // Do not change the order of entries or remove entries in this list
@@ skipping 449 matching lines @@
 
   UpdatedExtensionPermissionsInfo(
       const Extension* extension,
       const PermissionSet* permissions,
       Reason reason);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_EXTENSION_H_