[Sync] Add support for retrying a getupdates due to a context change

sync/engine/backoff_delay_provider_unittest.cc

 // Copyright (c) 2012 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 "sync/engine/backoff_delay_provider.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "sync/internal_api/public/engine/polling_constants.h"
 #include "sync/internal_api/public/sessions/model_neutral_state.h"
@@ skipping 39 matching lines @@
             delay->GetInitialDelay(state).InSeconds());
 
   state.last_download_updates_result = SERVER_RETURN_TRANSIENT_ERROR;
   EXPECT_EQ(kInitialBackoffRetrySeconds,
             delay->GetInitialDelay(state).InSeconds());
 
   state.last_download_updates_result = SERVER_RESPONSE_VALIDATION_FAILED;
   EXPECT_EQ(kInitialBackoffRetrySeconds,
             delay->GetInitialDelay(state).InSeconds());
 
+  state.last_download_updates_result = DATATYPE_TRIGGERED_RETRY;
+  EXPECT_EQ(kInitialBackoffImmediateRetrySeconds,
+            delay->GetInitialDelay(state).InSeconds());
+
   state.last_download_updates_result = SYNCER_OK;
   // Note that updating credentials triggers a canary job, trumping
   // the initial delay, but in theory we still expect this function to treat
   // it like any other error in the system (except migration).
   state.commit_result = SERVER_RETURN_INVALID_CREDENTIAL;
   EXPECT_EQ(kInitialBackoffRetrySeconds,
             delay->GetInitialDelay(state).InSeconds());
 
   state.commit_result = SERVER_RETURN_MIGRATION_DONE;
   EXPECT_EQ(kInitialBackoffImmediateRetrySeconds,
@@ skipping 22 matching lines @@
             delay->GetInitialDelay(state).InSeconds());
 
   state.last_download_updates_result = SERVER_RETURN_TRANSIENT_ERROR;
   EXPECT_EQ(kInitialBackoffShortRetrySeconds,
             delay->GetInitialDelay(state).InSeconds());
 
   state.last_download_updates_result = SERVER_RESPONSE_VALIDATION_FAILED;
   EXPECT_EQ(kInitialBackoffShortRetrySeconds,
             delay->GetInitialDelay(state).InSeconds());
 
+  state.last_download_updates_result = DATATYPE_TRIGGERED_RETRY;
+  EXPECT_EQ(kInitialBackoffImmediateRetrySeconds,
+            delay->GetInitialDelay(state).InSeconds());
+
   state.last_download_updates_result = SYNCER_OK;
   // Note that updating credentials triggers a canary job, trumping
   // the initial delay, but in theory we still expect this function to treat
   // it like any other error in the system (except migration).
   state.commit_result = SERVER_RETURN_INVALID_CREDENTIAL;
   EXPECT_EQ(kInitialBackoffShortRetrySeconds,
             delay->GetInitialDelay(state).InSeconds());
 
   state.commit_result = SERVER_RETURN_MIGRATION_DONE;
   EXPECT_EQ(kInitialBackoffImmediateRetrySeconds,
             delay->GetInitialDelay(state).InSeconds());
 
   state.commit_result = SERVER_RETURN_CONFLICT;
   EXPECT_EQ(kInitialBackoffImmediateRetrySeconds,
             delay->GetInitialDelay(state).InSeconds());
 }
 
 }  // namespace syncer