system_web_apps: Generalize ShouldReuseExistingWindow

Replace SystemWebAppDelegate's ShouldReuseExistingWindow with a function
GetWindowForLaunch that returns the window to be reused or, to request
a new window, nullptr. The default implementation uses
FindSystemWebAppBrowser such that an existing window is reused as
before.

Besides giving system web apps more flexibility, this lets us simplify
crosapi's UrlAshHandler and makes it easier to invoke the OS_URL_HANDLER
app from elsewhere (esp. in an upcoming CL).

Bug: chromium:1338903
Change-Id: I42c1a52116e93304c4b485581229e790eaf9a19e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4060866
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Jiewei Qian <qjw@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1078980}
25 files changed
tree: fdc1a8a7e4e1e39063b55eb23dc327912a040fc9
  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. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. DIR_METADATA
  68. ENG_REVIEW_OWNERS
  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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