Add StartScan API in lorgnette_manager_client

* Add a function StartScan to the lorgnette_manager_client API that
  allows scanning images using lorgnette's StartScan function.
  - Clients of the API can pass a RepeatingCallback<void(int)>, which
    will be invoked whenever the scan progress has updated.

* Implement StartScan for fake_lorgnette_manager_client.
* Update document_scan_api and unittests to use StartScan instead of
  ScanImageToString.

Bug: b:158504381
Change-Id: I6ca9e7645dc47a72d517d3d7480ea0f12e840e0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332852
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Jesse Schettler <jschettler@chromium.org>
Commit-Queue: Fletcher Woodruff <fletcherw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795215}
6 files changed
tree: 4790beeffade9f921fbbafcc7fcc28557ac0821d
  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. cloud_print/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. jingle/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .vpython
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. DIR_METADATA
  68. ENG_REVIEW_OWNERS
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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