[M103] Fix a regression that CascadeLayerMap is not rebuilt

A previous patch [1] introduced a regression that CascadeLayerMap is not
rebuilt if (1) previously there are no layers, and (2) layers are added.

This patch fixes it by making sure that CascadeLayerMap is always
rebuilt if there are layers in the new active style sheets, including
two cases (which are not necessarily disjoint):
1. Before updating active style, there are already layers
2. There are layers in the changed rule sets

[1] https://chromium-review.googlesource.com/c/chromium/src/+/3572544

(cherry picked from commit 523fd78e888c0ecd894fd997b13118f028bc14dd)

Fixed: 1326791
Change-Id: I05d2aa9dbc9b69d6fbf26abd9a74f27fc3c8aec7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3656429
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Auto-Submit: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1005842}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3659435
Commit-Queue: Anders Hartvoll Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/branch-heads/5060@{#170}
Cr-Branched-From: b83393d0f4038aeaf67f970a024d8101df7348d1-refs/heads/main@{#1002911}
3 files changed
tree: 69d3e83dffd912ec1ed51e92964a507eedb9b51c
  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/
  22. fuchsia_webengine/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  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. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  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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