Install and launch kiosk app from cached crx file at start up.

chrome/browser/chromeos/extensions/external_cache.cc

Index: chrome/browser/chromeos/extensions/external_cache.cc
diff --git a/chrome/browser/chromeos/extensions/external_cache.cc b/chrome/browser/chromeos/extensions/external_cache.cc
index 1f8fcaab99dee624ff3868c1c849fb6a59d642f9..cfb6c3c295fbb0dec32a1ca85a975adf01feb4de 100644
--- a/chrome/browser/chromeos/extensions/external_cache.cc
+++ b/chrome/browser/chromeos/extensions/external_cache.cc
@@ -58,6 +58,7 @@ void ExternalCache::Shutdown(const base::Closure& callback) {
 void ExternalCache::UpdateExtensionsList(
     scoped_ptr<base::DictionaryValue> prefs) {
   extensions_ = prefs.Pass();
+  extensions_status_.clear();
 
   if (extensions_->empty()) {
     // If list of know extensions is empty, don't init cache on disk. It is
@@ -151,13 +152,17 @@ void ExternalCache::OnExtensionDownloadFailed(
     if (!cached_extensions_->HasKey(id)) {
       LOG(ERROR) << "ExternalCache extension " << id
                  << " not found on update server";
+      extensions_status_[id] = DOWNLOAD_FAILED;
       delegate_->OnExtensionDownloadFailed(id, error);
     } else {
+      // No version update for an already cached extension.
+      extensions_status_[id] = DOWNLOAD_SUCCEEDED;
       delegate_->OnExtensionLoadedInCache(id);
     }
   } else {
     LOG(ERROR) << "ExternalCache failed to download extension " << id
                << ", error " << error;
+    extensions_status_[id] = DOWNLOAD_FAILED;
     delegate_->OnExtensionDownloadFailed(id, error);
   }
 }
@@ -179,7 +184,15 @@ void ExternalCache::OnExtensionDownloadFinished(
 
 bool ExternalCache::IsExtensionPending(const std::string& id) {
   // Pending means that there is no installed version yet.
-  return extensions_->HasKey(id) && !cached_extensions_->HasKey(id);
+  return extensions_->HasKey(id) && !cached_extensions_->HasKey(id) &&
+         extensions_status_.find(id) != extensions_status_.end() &&
+         extensions_status_[id] != DOWNLOAD_FAILED;

[xiyuan, 2014/05/29 19:49:01]

Not sure if we should change this. Other call sites might use the function as a
signal of whether to use the cached extension. The code here changes that
expectation.

[jennyz, 2014/07/07 21:11:12]

removed the change from this function.

+}
+
+bool ExternalCache::IsExtensionPendingForUpdateCheck(const std::string& id) {
+  return extensions_->HasKey(id) && cached_extensions_->HasKey(id) &&
+         extensions_status_.find(id) != extensions_status_.end() &&
+         extensions_status_[id] == DOWNLOAD_PENDING;
 }
 
 bool ExternalCache::GetExtensionExistingVersion(const std::string& id,
@@ -213,6 +226,7 @@ void ExternalCache::CheckCache() {
   }
 
   cached_extensions_->Clear();
+  extensions_status_.clear();
   for (base::DictionaryValue::Iterator it(*extensions_.get());
        !it.IsAtEnd(); it.Advance()) {
     const base::DictionaryValue* entry = NULL;
@@ -234,8 +248,10 @@ void ExternalCache::CheckCache() {
       else if (always_check_updates_)
         update_url = extension_urls::GetWebstoreUpdateUrl();
 
-      if (update_url.is_valid())
+      if (update_url.is_valid()) {
         downloader_->AddPendingExtension(it.key(), update_url, 0);
+        extensions_status_[it.key()] = DOWNLOAD_PENDING;
+      }
     }
 
     base::FilePath file_path;
@@ -315,6 +331,7 @@ void ExternalCache::OnPutExtension(const std::string& id,
                    file_path.value());
 
   cached_extensions_->Set(id, entry);
+  extensions_status_[id] = DOWNLOAD_SUCCEEDED;
   if (delegate_)
     delegate_->OnExtensionLoadedInCache(id);
   UpdateExtensionLoader();