Set event handled for after staring touch drag

When starting a touch drag action with the new drag and drop flow,
AppListItemView has to explicitly invoke RunShellDrag on the first
ET_GESTURE_SCROLL_UPDATE to keep the same behavior as before.

Since the drag and drop is handled on a different thread, there may be
edge cases where the dragged view could be removed before the drag
completes.

If the gesture event results in RunShellDrag being invoked, we need to
make sure that the event is marked handled in order for the event
handler to avoid trying to propagate the event further on a possibly
non-existing object.

Bug: b:277231250
Change-Id: Ie768da3a2c3c93af3eddc2cea667c1e1b4cccb48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4406687
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Commit-Queue: Ana Salazar <anasalazar@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1127457}
2 files changed
tree: 47f2e1cdbffb19fe984cb1bb5d1b90c51af249c6
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  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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