Reland "[AW][Dev-UI] Reland "Add some espresso tests for flag UI""

This is a reland of db9be6c9d1c4f61897dd047d9fa1f7821b244e15

The recent flakes are most probably caused by using of UIAutomator APIs
to test the developer UI service notification and pressing home button
in the tearDown of tests. This reland the CL after removing all
UIAutomator code including the test for persistent notification. A
separate reland of that test would be done later.

Original change's description:
> [AW][Dev-UI] Reland "Add some espresso tests for flag UI"
>
> This relands https://crbug.com/c/2438534 with a couple small changes:
>
> - android:windowSoftInputMode="adjustPan" attribute was missing in the
>   test manifest but is used in prod manifest. Adding it to the tests
>   manifest fixes the problem of auto-showing the keyboard on M devices
>   which was causing the test flakiness. When the keyboard shows up it
>   hides the view causing espresso to fail.
>
> - Merge the small change from https://crrev.com/c/2455687 to
>   test whether the overrideFlagsMap has the correct entries.
>
> Fixed: 1135839, 1130599
> Test: run_webview_instrumentation_test_apk -f "*FlagsFragmentTest*" on android M emulator
> Change-Id: I973e8cd2b7a9c12651d7a6e14f11a368f6e06bad
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453564
> Reviewed-by: Changwan Ryu <changwan@chromium.org>
> Reviewed-by: Nate Fischer <ntfschr@chromium.org>
> Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#817184}

Change-Id: I9089d7e8d9b61b46b412061715abbf981da03706
Bug: 1130599, 1135839
Test: run_webview_instrumentation_test_apk -f "*FlagsFragmentTest*" --num_retries=0 --repeat=1000 --break-on-failure
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2482142
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818858}
6 files changed
tree: 38dcc735efbc605a63ba007093556c93ad6ffcbb
  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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