[Offline Pages] Fix flaky test due to actual loading of database.

chrome/test/base/testing_profile.cc

Index: chrome/test/base/testing_profile.cc
diff --git a/chrome/test/base/testing_profile.cc b/chrome/test/base/testing_profile.cc
index 90bab6b3f4592402c216e505f624fc4d430ebc44..0ea07e7e5ead73692e67b1005a972aa92dd1ccc0 100644
--- a/chrome/test/base/testing_profile.cc
+++ b/chrome/test/base/testing_profile.cc
@@ -124,6 +124,11 @@
 #include "chrome/browser/supervised_user/supervised_user_settings_service_factory.h"
 #endif
 
+#if BUILDFLAG(ANDROID_JAVA_UI)
+#include "chrome/browser/android/offline_pages/offline_page_model_factory.h"
+#include "components/offline_pages/stub_offline_page_model.h"
+#endif
+
 using base::Time;
 using bookmarks::BookmarkModel;
 using content::BrowserThread;
@@ -244,6 +249,13 @@ std::unique_ptr<KeyedService> BuildWebDataService(
       &TestProfileErrorCallback));
 }
 
+#if BUILDFLAG(ANDROID_JAVA_UI)
+std::unique_ptr<KeyedService> BuildOfflinePageModel(
+    content::BrowserContext* context) {
+  return base::MakeUnique<offline_pages::StubOfflinePageModel>();
+}
+#endif
+
 }  // namespace
 
 // static
@@ -610,6 +622,10 @@ void TestingProfile::CreateBookmarkModel(bool delete_file) {
     base::FilePath path = GetPath().Append(bookmarks::kBookmarksFileName);
     base::DeleteFile(path, false);
   }
+#if BUILDFLAG(ANDROID_JAVA_UI)
+  offline_pages::OfflinePageModelFactory::GetInstance()->SetTestingFactory(
+      this, BuildOfflinePageModel);
+#endif
   ManagedBookmarkServiceFactory::GetInstance()->SetTestingFactory(
       this, ManagedBookmarkServiceFactory::GetDefaultFactory());
   // This creates the BookmarkModel.