Adds a basic offline check to InstallableManager.

chrome/browser/installable/installable_manager.cc

Index: chrome/browser/installable/installable_manager.cc
diff --git a/chrome/browser/installable/installable_manager.cc b/chrome/browser/installable/installable_manager.cc
index a4990888722e0e1366dcdd520e21f0d47b68ed2d..0fac209527677dbb25fd64bef0a44d622cee5d3d 100644
--- a/chrome/browser/installable/installable_manager.cc
+++ b/chrome/browser/installable/installable_manager.cc
@@ -406,21 +406,29 @@ void InstallableManager::CheckServiceWorker() {
           web_contents->GetSiteInstance());
   DCHECK(storage_partition);
 
-  storage_partition->GetServiceWorkerContext()->CheckHasServiceWorker(
+  storage_partition->GetServiceWorkerContext()->CheckServiceWorkerStatus(
       web_contents->GetLastCommittedURL(), manifest().start_url,
-      base::Bind(&InstallableManager::OnDidCheckHasServiceWorker,
+      base::Bind(&InstallableManager::OnDidCheckServiceWorkerStatus,
                  weak_factory_.GetWeakPtr()));
 }
 
-void InstallableManager::OnDidCheckHasServiceWorker(bool has_service_worker) {
+void InstallableManager::OnDidCheckServiceWorkerStatus(
+    content::ServiceWorkerStatus sw_status) {

[dominickn, 2017/03/16 06:21:56]

Nit: Call the variable status for consistency with the header file

[piotrs, 2017/03/17 02:21:37]

Done.

   if (!GetWebContents())
     return;
 
-  if (has_service_worker) {
-    installable_->installable = true;
-  } else {
-    installable_->installable = false;
-    installable_->error = NO_MATCHING_SERVICE_WORKER;
+  switch (sw_status) {
+    case content::ServiceWorkerStatus::SERVICE_WORKER_WITH_FETCH_HANDLER:
+      installable_->installable = true;
+      break;
+    case content::ServiceWorkerStatus::SERVICE_WORKER_NO_FETCH_HANDLER:
+      installable_->installable = false;
+      installable_->error = NO_SERVICE_WORKER_FETCH_HANDLER;
+      break;
+    case content::ServiceWorkerStatus::NO_SERVICE_WORKER:
+      installable_->installable = false;
+      installable_->error = NO_MATCHING_SERVICE_WORKER;
+      break;
   }
 
   installable_->fetched = true;