Enforce the 'requirements' field in manifests.

chrome/browser/extensions/extension_prefs.h

Index: chrome/browser/extensions/extension_prefs.h
diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
index 51d61168aba35660e9020487ff8b7f820664d04b..832381833887769c35d18e07c359d50efc84c111 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -147,6 +147,18 @@ class ExtensionPrefs : public ContentSettingsStore::Observer,
       const Extension* extension,
       bool did_escalate);
 
+  // Does the extension declare requirements that the system does not meet?
+  bool HasUnsupportedRequirements(const std::string& extension_id);
+
+  // Remove any unsupported requirement warnings that this extension has.
+  void ClearUnsupportedRequirements(const std::string& extension_id);
+
+  void SetUnsupportedRequirements(const std::string& extension_id,
+                                  std::vector<std::string> requirement_errors);
+
+  std::vector<std::string> GetUnsupportedRequirements(
+      const std::string& extension_id);
+
   // Getter and setters for disabled reason.
   Extension::DisableReason GetDisableReason(
       const std::string& extension_id);