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 c1ffe6446c71feaa8794a6eef86b3c9e7acddb36..f25d58fc9f2c437966c598893f1b1a8cbf7ce147 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"
@@ -192,7 +193,9 @@ DictionaryValue* ExtensionSettingsHandler::CreateExtensionDetailValue(
   }
 
   // Add install warnings (these are not the same as warnings!).
-  if (extension->location() == Extension::LOAD) {
+  if (extension->location() == Extension::LOAD ||
+      extension_service_->extension_prefs()->HasUnsupportedRequirements(
+          extension->id())) {
     const Extension::InstallWarningVector& install_warnings =
         extension->install_warnings();
     if (!install_warnings.empty()) {
@@ -623,6 +626,11 @@ void ExtensionSettingsHandler::HandleEnableMessage(const ListValue* args) {
           web_ui()->GetWebContents());
       extensions::ShowExtensionDisabledDialog(
           extension_service_, browser, extension);
+    } else if (prefs->GetDisableReason(extension_id) ==
+               Extension::DISABLE_UNSUPPORTED_REQUIREMENT) {
+      ExtensionErrorReporter::GetInstance()->ReportError(
+          l10n_util::GetStringUTF16(IDS_EXTENSION_REQUIREMENT_DISABLE),
+          true /* be noisy */);
     } else {
       extension_service_->EnableExtension(extension_id);
     }