Add ability to query SelectionState relative to a cursor position

For composited selection to work in CAP, we'll need to record the start
and end of the selection at paint time. To facilitate this, we'll need
to know whether the selection rect we compute in order to paint the
selection background contains the start/end of the frame's selection.

This CL adds a way to query this information for a given cursor position
which will be consumed at paint time. There is a mechanism to understand
the selection state relative to a layout object, which we use to
determine which offsets are valid for comparison. The state returned
will inform the caller of the intersection of the frame's selection.

Bug: 1065049

Change-Id: I217f9e8859b0790543285ddd5de100adba1e5ecd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567021
Commit-Queue: Daniel Libby <dlibby@microsoft.com>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833228}
5 files changed
tree: e1520fb067ce227786e9b1ad6d2c3a345d6ece5a
  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. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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