Download Infobar : Fixed bugs in incognito

For incognito profiles, the infobar is not being shown since
the DownloadManagerService only starts observing the download item updates
after we open download home in incognito. Fixed this bug in this CL.

Bug: 846139
Change-Id: I507c285901474ce47f09a1610639805afe3c904f
Reviewed-on: https://chromium-review.googlesource.com/1073078
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563066}

chrome/browser/android/download/download_manager_service.cc

@@ -15,12 +15,14 @@
 #include "base/time/time.h"
 #include "chrome/browser/android/chrome_feature_list.h"
 #include "chrome/browser/android/download/download_controller.h"
+#include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/download/download_core_service.h"
 #include "chrome/browser/download/download_core_service_factory.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "components/download/public/common/download_item.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/download_item_utils.h"
+#include "content/public/browser/notification_service.h"
 #include "jni/DownloadInfo_jni.h"
 #include "jni/DownloadItem_jni.h"
 #include "jni/DownloadManagerService_jni.h"
@@ -137,6 +139,8 @@ static jlong JNI_DownloadManagerService_Init(
 DownloadManagerService::DownloadManagerService()
     : is_history_query_complete_(false),
       pending_get_downloads_actions_(NONE) {
+  registrar_.Add(this, chrome::NOTIFICATION_PROFILE_CREATED,
+                 content::NotificationService::AllSources());
 }
 
 DownloadManagerService::~DownloadManagerService() {}
@@ -147,6 +151,32 @@ void DownloadManagerService::Init(
   java_ref_.Reset(env, obj);
 }
 
+void DownloadManagerService::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  switch (type) {
+    case chrome::NOTIFICATION_PROFILE_CREATED: {
+      Profile* profile = content::Source<Profile>(source).ptr();
+      content::DownloadManager* manager =
+          content::BrowserContext::GetDownloadManager(profile);
+      if (!manager)
+        break;
+
+      auto& notifier = profile->IsOffTheRecord() ? off_the_record_notifier_
+                                                 : original_notifier_;
+
+      // Update notifiers to monitor any newly created DownloadManagers.
+      if (!notifier || notifier->GetManager() != manager) {
+        notifier =
+            std::make_unique<download::AllDownloadItemNotifier>(manager, this);
+      }
+    } break;
+    default:
+      NOTREACHED();
+  }
+}
+
 void DownloadManagerService::OpenDownload(
     JNIEnv* env,
     jobject obj,

chrome/browser/android/download/download_manager_service.h

@@ -17,6 +17,8 @@
 #include "chrome/browser/download/download_history.h"
 #include "components/download/content/public/all_download_item_notifier.h"
 #include "content/public/browser/download_manager.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 
 using base::android::JavaParamRef;
 
@@ -28,7 +30,8 @@ class DownloadItem;
 // Java object.
 class DownloadManagerService
     : public download::AllDownloadItemNotifier::Observer,
-      public DownloadHistory::Observer {
+      public DownloadHistory::Observer,
+      public content::NotificationObserver {
  public:
   static void OnDownloadCanceled(
       download::DownloadItem* download,
@@ -115,6 +118,11 @@ class DownloadManagerService
   void OnDownloadRemoved(content::DownloadManager* manager,
                          download::DownloadItem* item) override;
 
+  // content::NotificationObserver methods.
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
  protected:
   // Called to get the content::DownloadManager instance.
   virtual content::DownloadManager* GetDownloadManager(bool is_off_the_record);
@@ -180,6 +188,9 @@ class DownloadManagerService
 
   ResumeCallback resume_callback_for_testing_;
 
+  // The Registrar used to register for notifications.
+  content::NotificationRegistrar registrar_;
+
   std::unique_ptr<download::AllDownloadItemNotifier> original_notifier_;
   std::unique_ptr<download::AllDownloadItemNotifier> off_the_record_notifier_;