The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6fb560e0be6e124a89f10780668c3d150c0340e4

commit 6fb560e0be6e124a89f10780668c3d150c0340e4
Author: gangwu <gangwu@chromium.org>
Date: Fri May 12 04:34:22 2017

[USS] Add function for update storage key for processor

Add UpdateStorageKey into processor, so bridge can update storage key in
processor.

BUG= 719623 

Review-Url: https://codereview.chromium.org/2864713002
Cr-Commit-Position: refs/heads/master@{#471222}

[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model/fake_model_type_change_processor.cc
[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model/fake_model_type_change_processor.h
[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model/fake_model_type_sync_bridge.cc
[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model/fake_model_type_sync_bridge.h
[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model/model_type_change_processor.h
[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model_impl/processor_entity_tracker.cc
[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model_impl/processor_entity_tracker.h
[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model_impl/shared_model_type_processor.cc
[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model_impl/shared_model_type_processor.h
[modify] https://crrev.com/6fb560e0be6e124a89f10780668c3d150c0340e4/components/sync/model_impl/shared_model_type_processor_unittest.cc