Make the About box display existing pending operations instead of firing off a new update check

chrome/app/keystone_glue.mm

Index: chrome/app/keystone_glue.mm
===================================================================
--- chrome/app/keystone_glue.mm	(revision 30078)
+++ chrome/app/keystone_glue.mm	(working copy)
@@ -241,11 +241,15 @@
 }
 
 - (void)checkForUpdate {
+  DCHECK(![self asyncOperationPending]);
+
   if (!registration_) {
     [self updateStatus:kAutoupdateCheckFailed version:nil];
     return;
   }
 
+  [self updateStatus:kAutoupdateChecking version:nil];
+
   [registration_ checkForUpdate];
 
   // Upon completion, KSRegistrationCheckForUpdateNotification will be posted,
@@ -271,11 +275,15 @@
 }
 
 - (void)installUpdate {
+  DCHECK(![self asyncOperationPending]);
+
   if (!registration_) {
     [self updateStatus:kAutoupdateInstallFailed version:nil];
     return;
   }
 
+  [self updateStatus:kAutoupdateInstalling version:nil];
+
   [registration_ startUpdate];
 
   // Upon completion, KSRegistrationStartUpdateNotification will be posted,
@@ -391,4 +399,15 @@
   recentNotification_.reset(nil);
 }
 
+- (AutoupdateStatus)recentStatus {
+  NSDictionary* dictionary = [recentNotification_ userInfo];
+  return static_cast<AutoupdateStatus>(
+      [[dictionary objectForKey:kAutoupdateStatusStatus] intValue]);
+}
+
+- (BOOL)asyncOperationPending {
+  AutoupdateStatus status = [self recentStatus];
+  return status == kAutoupdateChecking || status == kAutoupdateInstalling;
+}
+
 @end  // @implementation KeystoneGlue