Differentiate new permissions from old in extension permission update bubble

extensions/common/permissions/permissions_data.h

Index: extensions/common/permissions/permissions_data.h
diff --git a/extensions/common/permissions/permissions_data.h b/extensions/common/permissions/permissions_data.h
index 3b87e79bc393161819710e7d8cca9703cc0857e2..e3b43fa78595cf6d8f0e7ba959b9d76e93289f50 100644
--- a/extensions/common/permissions/permissions_data.h
+++ b/extensions/common/permissions/permissions_data.h
@@ -140,6 +140,11 @@ class PermissionsData {
   // display at install time, in a nested format ready for display.
   PermissionMessages GetPermissionMessages() const;
 
+  // Returns the full list of new permission details for messages that should
+  // display at install time, in a nested format ready for display.

[Devlin, 2017/04/20 16:40:53]

We should differentiate this from the other method, e.g.:
// Returns the list of permission details for permissions that are included in
active_permissions(), but not present in |granted_permissions|.  These are
returned in a nested format, ready for display.

[catmullings, 2017/04/20 17:10:38]

Done.

+  PermissionMessages GetNewPermissionMessages(
+      const PermissionSet& granted_permissions) const;
+
   // Returns true if the extension has requested all-hosts permissions (or
   // something close to it), but has had it withheld.
   bool HasWithheldImpliedAllHosts() const;