Observe back press state change with navigationStateChanged

Through TabObserve.onUrlUpdated & onTitleUpdated, we already observed
InvalidateTypes.Title and Url changes. This CL adds other types
observation, i.e: InvalidateTypes.Load and InvalidateTypes.Tab.

This CL is a speculative fix to back press refactor change as
we missed some signals of tab's back press state changed.
navigationStateChanged is supposed to be triggered as long as any navigation related change occurs in the navigation_controller_impl.cc.

Since load state is also observed through WebContentsObserver methods,
like WebContentsObserver.didStartLoading, new methods are behind
flags in order to observe the differences and avoid potential
performance cost.

This is also to mirror how the desktop side observes and updates the
toolbar back button.
https://source.chromium.org/chromium/chromium/src/+/refs/heads/main:chrome/browser/ui/browser.cc;l=1654;drc=66941d1f0cfe9155b400aef887fe39a403c1f518

Bug: 1433481, 1450625
Change-Id: Ia58b3074e995707bcbc907ab8ae01a6043811ebd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4592011
Commit-Queue: Lijin Shen <lazzzis@google.com>
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1154604}
6 files changed
tree: f6fdc11dc21142d1c16f93729f2b37686a695f05
  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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