[Offline Pages] Add a timer to BackgroundLoaderOffliner to delay SavePage by 2 seconds.

chrome/browser/android/offline_pages/background_loader_offliner_unittest.cc

Index: chrome/browser/android/offline_pages/background_loader_offliner_unittest.cc
diff --git a/chrome/browser/android/offline_pages/background_loader_offliner_unittest.cc b/chrome/browser/android/offline_pages/background_loader_offliner_unittest.cc
index b526e2160c67a21ee8c2c875e8504b88050a04a5..96b8a7c4b52296230e63a93efe372df99e953147 100644
--- a/chrome/browser/android/offline_pages/background_loader_offliner_unittest.cc
+++ b/chrome/browser/android/offline_pages/background_loader_offliner_unittest.cc
@@ -368,4 +368,23 @@ TEST_F(BackgroundLoaderOfflinerTest, FailsOnErrorPage) {
   EXPECT_EQ(Offliner::RequestStatus::LOADING_FAILED_NO_RETRY, request_status());
 }
 
+TEST_F(BackgroundLoaderOfflinerTest, OnlySavesOnceOnMultipleLoads) {
+  base::Time creation_time = base::Time::Now();
+  SavePageRequest request(kRequestId, kHttpUrl, kClientId, creation_time,
+                          kUserRequested);
+  EXPECT_TRUE(offliner()->LoadAndSave(request, callback()));
+  // First load
+  CompleteLoading();
+  // Second load
+  offliner()->DidStopLoading();
+  PumpLoop();
+  model()->CompleteSavingAsSuccess();
+  PumpLoop();
+
+  EXPECT_TRUE(completion_callback_called());
+  EXPECT_EQ(Offliner::RequestStatus::SAVED, request_status());
+  EXPECT_FALSE(offliner()->is_loading());
+  EXPECT_FALSE(SaveInProgress());
+}
+
 }  // namespace offline_pages