Adds a basic offline check to InstallableManager.

chrome/browser/installable/installable_manager.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/installable/installable_manager.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/manifest/manifest_icon_downloader.h"
@@ skipping 388 matching lines @@
   content::WebContents* web_contents = GetWebContents();
 
   // Check to see if there is a single service worker controlling this page
   // and the manifest's start url.
   content::StoragePartition* storage_partition =
       content::BrowserContext::GetStoragePartition(
           Profile::FromBrowserContext(web_contents->GetBrowserContext()),
           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;
   WorkOnTask();
 }
 
 void InstallableManager::CheckAndFetchBestIcon(const IconParams& params) {
   DCHECK(!manifest().IsEmpty());
 
   int ideal_icon_size_in_px = std::get<0>(params);
@@ skipping 57 matching lines @@
   return manifest_->url;
 }
 
 const content::Manifest& InstallableManager::manifest() const {
   return manifest_->manifest;
 }
 
 bool InstallableManager::is_installable() const {
   return installable_->installable;
 }