Update the request count when a request fails.

components/offline_pages/background/request_coordinator_unittest.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 "components/offline_pages/background/request_coordinator.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 339 matching lines @@
       base::Bind(
           &RequestCoordinatorTest::EmptyCallbackFunction,
           base::Unretained(this));
   coordinator()->SetProcessingCallbackForTest(callback);
 
   // Call the OfflinerDoneCallback to simulate the request failed, wait
   // for callbacks.
   EnableOfflinerCallback(true);
   SendOfflinerDoneCallback(request,
                            Offliner::RequestStatus::PRERENDERING_FAILED);
+  // There will be one request left in the queue after the prerender fails, stop
+  // processing now so that it will remain in the queue for us to check.  This
+  // won't affect the offliner done callback other than preventing
+  // TryNextRequest from doing anything.
+  coordinator()->StopProcessing();
+
   PumpLoop();
 
   // Verify the request is not removed from the queue, and wait for callbacks.
   coordinator()->queue()->GetRequests(
       base::Bind(&RequestCoordinatorTest::GetRequestsDone,
                  base::Unretained(this)));
   PumpLoop();
 
   // Still one request in the queue.
   EXPECT_EQ(1UL, last_requests().size());
-  // TODO(dougarnett): Verify retry count gets incremented.
+  // Verify retry count was incremented.
+  const SavePageRequest& found_request = last_requests().front();
+  EXPECT_EQ(1L, found_request.attempt_count());
 }
 
 // This tests a StopProcessing call before we have actually started the
 // prerenderer.
 TEST_F(RequestCoordinatorTest, StartProcessingThenStopProcessingImmediately) {
   // Add a request to the queue, wait for callbacks to finish.
   offline_pages::SavePageRequest request(
       kRequestId, kUrl, kClientId, base::Time::Now());
   coordinator()->queue()->AddRequest(
       request,
@@ skipping 103 matching lines @@
   // tasks too soon.
   WaitForCallback();
   PumpLoop();
 
   EXPECT_TRUE(OfflinerWasCanceled());
   EXPECT_EQ(Offliner::RequestStatus::REQUEST_COORDINATOR_CANCELED,
             last_offlining_status());
 }
 
 }  // namespace offline_pages