Use TabLoader in TabRestoreService.

chrome/browser/ui/browser_tabrestore_browsertest.cc

Index: chrome/browser/ui/browser_tabrestore_browsertest.cc
diff --git a/chrome/browser/ui/browser_tabrestore_browsertest.cc b/chrome/browser/ui/browser_tabrestore_browsertest.cc
index 5fd6ac3b360794502826296ed6e0d22dce54bf7c..0fdfad57e4bf9f8476ed94609b7f825d8c7b774d 100644
--- a/chrome/browser/ui/browser_tabrestore_browsertest.cc
+++ b/chrome/browser/ui/browser_tabrestore_browsertest.cc
@@ -13,6 +13,7 @@
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/interactive_test_utils.h"
 #include "components/sessions/core/tab_restore_service.h"
+#include "content/public/browser/notification_service.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/browser_test_utils.h"
@@ -90,6 +91,21 @@ IN_PROC_BROWSER_TEST_F(BrowserTabRestoreTest, RecentTabsMenuTabDisposition) {
   EXPECT_EQ(2u, active_browser_list->size());
   browser = active_browser_list->get(1);
   EXPECT_EQ(3, browser->tab_strip_model()->count());
+  // For the two test tabs we've just received "READY" DOM message.
+  // But there won't be such message from the "about:blank" tab.
+  // And it is possible that TabLoader hasn't loaded it yet.
+  // Thus we should wait for "load stop" event before we will perform
+  // CheckVisbility on "about:blank".
+  {
+    const auto* about_blank = browser->tab_strip_model()->GetWebContentsAt(0);

[sky, 2017/03/02 19:12:05]

about_blank_contents?
optional: mild preference for no auto* here.

[Michael K. (Yandex Team), 2017/03/03 08:26:37]

Done.

+    EXPECT_EQ("about:blank", about_blank->GetURL().spec());
+    content::WindowedNotificationObserver load_stop_observer(

[sky, 2017/03/02 19:12:05]

Move this into if?

[Michael K. (Yandex Team), 2017/03/03 08:26:37]

Done.

+        content::NOTIFICATION_LOAD_STOP,
+        content::Source<content::NavigationController>(
+            &about_blank->GetController()));
+    if (about_blank->IsLoading() || about_blank->GetController().NeedsReload())
+      load_stop_observer.Wait();
+  }
 
   // The middle tab only should have visible disposition.
   CheckVisbility(browser->tab_strip_model(), 1);
@@ -132,6 +148,18 @@ IN_PROC_BROWSER_TEST_F(BrowserTabRestoreTest, DelegateRestoreTabDisposition) {
   EXPECT_EQ(2u, active_browser_list->size());
   browser = active_browser_list->get(1);
   EXPECT_EQ(3, browser->tab_strip_model()->count());
+  // The same as in RecentTabsMenuTabDisposition test case.
+  // See there for the explanation.
+  {
+    const auto* about_blank = browser->tab_strip_model()->GetWebContentsAt(0);

[sky, 2017/03/02 19:12:05]

Similar comments as above.

[Michael K. (Yandex Team), 2017/03/03 08:26:37]

Done.

+    EXPECT_EQ("about:blank", about_blank->GetURL().spec());
+    content::WindowedNotificationObserver load_stop_observer(
+        content::NOTIFICATION_LOAD_STOP,
+        content::Source<content::NavigationController>(
+            &about_blank->GetController()));
+    if (about_blank->IsLoading() || about_blank->GetController().NeedsReload())
+      load_stop_observer.Wait();
+  }
 
   // The middle tab only should have visible disposition.
   CheckVisbility(browser->tab_strip_model(), 1);