Add offline_enabled field in manifest.

chrome/common/extensions/extension.cc

Index: chrome/common/extensions/extension.cc
diff --git a/chrome/common/extensions/extension.cc b/chrome/common/extensions/extension.cc
index 1b623538d0ce3e7064f8213bb0938268844e8943..c91b568d50ea8d51b0e3eed1aeace07443e1a344 100644
--- a/chrome/common/extensions/extension.cc
+++ b/chrome/common/extensions/extension.cc
@@ -1190,7 +1190,8 @@ bool Extension::EnsureNotHybridApp(const DictionaryValue* manifest,
         *key != keys::kPermissions &&
         *key != keys::kOptionalPermissions &&
         *key != keys::kOptionsPage &&
-        *key != keys::kBackground) {
+        *key != keys::kBackground &&
+        *key != keys::kOfflineEnabled) {
       *error = ExtensionErrorUtils::FormatErrorMessage(
           errors::kHostedAppsCannotIncludeExtensionFeatures, *key);
       return false;
@@ -1208,6 +1209,7 @@ bool Extension::IsTrustedId(const std::string& id) {
 
 Extension::Extension(const FilePath& path, Location location)
     : incognito_split_mode_(false),
+      offline_enabled_(false),
       location_(location),
       converted_from_user_script_(false),
       is_theme_(false),
@@ -1870,7 +1872,7 @@ bool Extension::InitFromValue(const DictionaryValue& source, int flags,
   }
 
   // Initialize options page url (optional).
-  // Funtion LoadIsApp() set is_app_ above.
+  // Function LoadIsApp() set is_app_ above.
   if (source.HasKey(keys::kOptionsPage)) {
     std::string options_str;
     if (!source.GetString(keys::kOptionsPage, &options_str)) {
@@ -2305,6 +2307,14 @@ bool Extension::InitFromValue(const DictionaryValue& source, int flags,
     }
   }
 
+  // Initialize offline-enabled status. Defaults to false.
+  if (source.HasKey(keys::kOfflineEnabled)) {
+    if (!source.GetBoolean(keys::kOfflineEnabled, &offline_enabled_)) {
+      *error = errors::kInvalidOfflineEnabled;
+      return false;
+    }
+  }
+
   if (HasMultipleUISurfaces()) {
     *error = errors::kOneUISurfaceOnly;
     return false;