[office] serialise uploads

Every upload handler creates a separate CopyOrMoveIOTask for each file,
which does its own conflict resolution. This may result in tasks
resolving to the same destination file, and multiple source files being
copied to the same destination, losing one of the files.

In the long run we should have a single CopyOrMoveIOTask here, but
serialising uploads is the least invasive change at this point.

(cherry picked from commit 3facb0fec956f69dc41be1c73fc0028ec41b18c1)

Bug: b/325356207
Change-Id: Ie5af1f0da346ef913fe8fa004418fb34c84a9139
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5302359
Commit-Queue: Alexander Bolodurin <alexbn@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1261480}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5305837
Reviewed-by: Josh Simmons <simmonsjosh@google.com>
Cr-Commit-Position: refs/branch-heads/6261@{#938}
Cr-Branched-From: 9755d9d81e4a8cb5b4f76b23b761457479dbb06b-refs/heads/main@{#1250580}
2 files changed
tree: 3d8b88a9cc9d2dc1244830183b51a96bb1adce3b
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. codelabs/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. DEPS
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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