Cause the 'enable-nacl' flag to be locked with enabling the NaCl plugin.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 436e76edab66f47f4aa557c2e39e4a040d189038..ec530d9987b8ef862e7ec831a435d72f1504e006 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -12,9 +12,12 @@
 #include "base/command_line.h"
 #include "base/memory/singleton.h"
 #include "base/string_number_conversions.h"
+#include "base/utf_string_conversions.h"
 #include "base/values.h"
+#include "chrome/browser/plugin_updater.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
+#include "chrome/common/chrome_content_client.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "content/browser/user_metrics.h"
@@ -672,10 +675,21 @@ void FlagsState::SetExperimentEnabled(
   DCHECK(e);
 
   if (e->type == Experiment::SINGLE_VALUE) {
-    if (enable)
+    if (enable) {
       enabled_experiments.insert(internal_name);
-    else
+      // If enabling NaCl, make sure the plugin is also enabled. See bug
+      // http://code.google.com/p/chromium/issues/detail?id=81010 for more
+      // information.
+      // TODO(dspringer): When NaCl is on by default, remove this code.
+      if (internal_name == "enable-nacl") {

[jam, 2011/05/19 22:56:46]

is there no constant for this?  kEnableNaCl?  

[der Springer, 2011/05/20 17:47:16]

Done.

+        PluginUpdater* plugin_updater = PluginUpdater::GetInstance();
+        string16 nacl_plugin_name =
+            ASCIIToUTF16(chrome::ChromeContentClient::kNaClPluginName);
+        plugin_updater->EnablePluginGroup(true, nacl_plugin_name);
+      }
+    } else {
       enabled_experiments.erase(internal_name);
+    }
   } else {
     if (enable) {
       // Enable the first choice.