Run PDF Searchify only when needed.

Do not schedule PDF page for searchify when it has no images and do not
start OCR service when no page is scheduled for searchify.

Patchset 1 is the reverted CL http://crrev.com/c/6609060 which failed
on "Win10 Tests x64" trybot which runs the tests with
`--disable-field-trial-config` switch which results in
`PdfViewWebPlugin::DocumentLoadComplete` getting called before any
page is loaded, while the CL assumed the call is done only after all
pages are loaded.

To fix the issue, change the flow to pass OCR service callbacks to
the `PdfiumEngine` in `DocumentLoadComplete` (like before), but make
the first contact with the OCR service only after any page is scheduled
for searchify.

Cq-Include-Trybots: luci.chrome.try:win10-1507-tests-x64

Bug: 421574222
Change-Id: I78ec41463fb00f3d9005a3f2d24959a7fc15c7db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6620821
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1470945}
8 files changed
tree: f6d1d7bd9b7b9a267a0cc23e70926c09f97f8aea
  1. .github/
  2. android_webview/
  3. apps/
  4. ash/
  5. base/
  6. build/
  7. build_overrides/
  8. buildtools/
  9. cc/
  10. chrome/
  11. chromecast/
  12. chromeos/
  13. codelabs/
  14. components/
  15. content/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. gpu/
  25. headless/
  26. infra/
  27. ios/
  28. ipc/
  29. media/
  30. mojo/
  31. native_client_sdk/
  32. net/
  33. pdf/
  34. ppapi/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .git-blame-ignore-revs
  54. .gitallowed
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. CPPLINT.cfg
  69. CRYPTO_OWNERS
  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. SECURITY_OWNERS
  80. WATCHLISTS
README.md

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