Reland "ipcz: Introduce ipcz.h API and skeleton impl"

This is a reland of commit f759138bb429ceddaa8e5cd36c42589c32b00a9c
which was reverted due to conflicting definitions of IpczGetAPI().

The duplication was a result of a declaration in ipcz.h combined
with the definition in api.cc, as the latter may differ subtly
(namely +dllexport) when building the ipcz_shared target.

The right solution is actually to not define IpczGetAPI() in
ipcz.h at all, since applications may want to resolve this
symbol manually at runtime anyway.

If something statically links against ipcz, src/api.h can now be
included to get an appropriate declaration of IpczGetAPI().
Dynamically linked consumers will either need to provide their
own import declaration, or will manually resolve the symbol at
runtime via dlsym/GetProcAddress/etc.

Original change's description:
> ipcz: Introduce ipcz.h API and skeleton impl
>
> Split out from the ipcz uber-CL: https://crrev.com/c/3570271
>
> This adds the complete ipcz.h header.
>
> All API functions do nothing and return IPCZ_RESULT_UNIMPLEMENTED. A
> basic test is added to cover these calls.
>
> Bug: 1299283
> Change-Id: I2bea579efef985056d32e32f3259aa35c0db2113
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3572169
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Commit-Queue: Ken Rockot <rockot@google.com>
> Cr-Commit-Position: refs/heads/main@{#991134}

Bug: 1299283
Change-Id: I888008a6b433f7943e509fd58c996b37fdc572b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3582897
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/main@{#991593}
7 files changed
tree: 2f923ef875b08599ae89395c705dd628aa10e291
  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. 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. .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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