Add a preference to force enable the NaCl plugin as we transition to

chrome/browser/plugin_updater.cc

Index: chrome/browser/plugin_updater.cc
===================================================================
--- chrome/browser/plugin_updater.cc	(revision 97988)
+++ chrome/browser/plugin_updater.cc	(working copy)
@@ -155,6 +155,24 @@
     force_enable_internal_pdf = true;
   }
 
+  bool force_enable_nacl = false;
+  string16 nacl_group_name =
+      ASCIIToUTF16(chrome::ChromeContentClient::kNaClPluginName);
+  // Since the NaCl Plugin changed names between Chrome 13 and 14, we need to
+  // check for both because either could be stored as the plugin group name.
+  string16 old_nacl_group_name =
+      ASCIIToUTF16(chrome::ChromeContentClient::kNaClOldPluginName);
+  FilePath nacl_path;
+  PathService::Get(chrome::FILE_NACL_PLUGIN, &nacl_path);
+  FilePath::StringType nacl_path_str = nacl_path.value();
+  if (!profile->GetPrefs()->GetBoolean(prefs::kPluginsEnabledNaCl)) {
+    // We switched to the nacl plugin being on by default, and so we need to
+    // force it to be enabled.  We only want to do it this once though, i.e.
+    // we don't want to enable it again if the user disables it afterwards.
+    profile->GetPrefs()->SetBoolean(prefs::kPluginsEnabledNaCl, true);
+    force_enable_nacl = true;
+  }
+
   {  // Scoped update of prefs::kPluginsPluginsList.
     ListPrefUpdate update(profile->GetPrefs(), prefs::kPluginsPluginsList);
     ListValue* saved_plugins_list = update.Get();
@@ -196,15 +214,23 @@
             }
 
             internal_pdf_enabled = enabled;
+          } else if (FilePath::CompareIgnoreCase(path, nacl_path_str) == 0) {
+            if (!enabled && force_enable_nacl) {
+              enabled = true;
+              plugin->SetBoolean("enabled", true);
+            }
           }
 
           if (!enabled)
             webkit::npapi::PluginList::Singleton()->DisablePlugin(plugin_path);
         } else if (!enabled && plugin->GetString("name", &group_name)) {
-          // Don't disable this group if it's for the pdf plugin and we just
-          // forced it on.
+          // Don't disable this group if it's for the pdf or nacl plugins and
+          // we just forced it on.
           if (force_enable_internal_pdf && pdf_group_name == group_name)
             continue;
+          if (force_enable_nacl && (nacl_group_name == group_name ||
+                                    old_nacl_group_name == group_name))
+            continue;
 
           // Otherwise this is a list of groups.
           EnablePluginGroup(false, group_name);
@@ -213,8 +239,10 @@
     } else {
       // If the saved plugin list is empty, then the call to UpdatePreferences()
       // below failed in an earlier run, possibly because the user closed the
-      // browser too quickly. Try to force enable the internal PDF plugin again.
+      // browser too quickly. Try to force enable the internal PDF and nacl
+      // plugins again.
       force_enable_internal_pdf = true;
+      force_enable_nacl = true;
     }
   }  // Scoped update of prefs::kPluginsPluginsList.
 
@@ -242,7 +270,7 @@
         webkit::npapi::PluginGroup::kAdobeReaderGroupName));
   }
 
-  if (force_enable_internal_pdf) {
+  if (force_enable_internal_pdf || force_enable_nacl) {
     // We want to save this, but doing so requires loading the list of plugins,
     // so do it after a minute as to not impact startup performance.  Note that
     // plugins are loaded after 30s by the metrics service.