Enforce the 'requirements' field in manifests.

chrome/browser/ui/webui/extensions/extension_settings_handler.cc

Index: chrome/browser/ui/webui/extensions/extension_settings_handler.cc
diff --git a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
index 163ffdf3b8cf918fd8e800834fb2462fbebc9f75..8dbbb4cd1094c91db8ec47b552bb8e8c29eeaf04 100644
--- a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
+++ b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
@@ -18,6 +18,7 @@
 #include "chrome/browser/debugger/devtools_window.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_disabled_ui.h"
+#include "chrome/browser/extensions/extension_error_reporter.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
@@ -624,6 +625,11 @@ void ExtensionSettingsHandler::HandleEnableMessage(const ListValue* args) {
           web_ui()->GetWebContents());
       extensions::ShowExtensionDisabledDialog(
           extension_service_, browser, extension);
+    } else if (prefs->GetDisableReasons(extension_id) &
+               Extension::DISABLE_UNSUPPORTED_REQUIREMENT) {
+      ExtensionErrorReporter::GetInstance()->ReportError(

[Aaron Boodman, 2012/08/21 23:04:21]

I think that we should do this inside ExtensionService::EnableExtension()
instead.

[eaugusti, 2012/08/24 19:30:52]

No move. Discussed irl.

+          l10n_util::GetStringUTF16(IDS_EXTENSION_REQUIREMENT_DISABLE),
+          true /* be noisy */);
     } else {
       extension_service_->EnableExtension(extension_id);
     }