add the EditorEventSink proxy class which sends input-related events from the browser into the shared library.

The shared lib needs to be aware of the current surrounding text.

This CL adds a new method, which allows the `editor mediator` to listen to the change of the surrounding text that originates from `native input method engine observer`. Upon receiving the new surrounding text, the editor mediator instance then calls the EditorEventSinkProxy instance which in turns sends data that contains the current surrounding text to the shared lib via `OnContextUpdated()` mojom method.

Bug: b:298285960
Change-Id: I96337260c70d34b581b9c2373fdaea957c99ca29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4828063
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Chuong Ho <hdchuong@google.com>
Cr-Commit-Position: refs/heads/main@{#1196931}
7 files changed
tree: 27c37199f09041471a5a8e2d4e2cc55d371788f5
  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. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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