[PA] Move README, OWNERS, DEPS, BUILD.gn to top-level dir.

This is a follow-up to:
https://chromium-review.googlesource.com/c/chromium/src/+/4812338

The previous patch moved the whole PA directory into
"src/partition_alloc" without putting much thinking about individual
files.

This follow-up moves the README, OWNERS, DEPS, BUILD.gn file into the
top-level directory.

Bug: chromium:1467773
Change-Id: Ie9f457fe957bbf27779892eece606eb220d50cb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4934632
Owners-Override: danakj <danakj@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Takashi Sakamoto <tasak@google.com>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1210356}
NOKEYCHECK=True
GitOrigin-RevId: c8ca46524226127e51531c08bab01d049d4a3083
3 files changed
tree: 835e94deb2b2641b109b51b555df10cc06f9ca18
  1. angle.gni
  2. build.gni
  3. dawn.gni
  4. glslang.gni
  5. gtest.gni
  6. ipcz.gni
  7. OWNERS
  8. partition_alloc.gni
  9. pdfium.gni
  10. README.md
  11. spirv_tools.gni
  12. swiftshader.gni
  13. tint.gni
  14. vulkan_common.gni
  15. vulkan_headers.gni
  16. vulkan_loader.gni
  17. vulkan_tools.gni
  18. vulkan_utility_libraries.gni
  19. vulkan_validation_layers.gni
  20. wayland.gni
README.md

Build overrides in GN

This directory is used to allow different products to customize settings for repos that are DEPS'ed in or shared.

For example: V8 could be built on its own (in a “standalone” configuration), and it could be built as part of Chromium. V8 might define a top-level target, //v8:d8 (a simple executable), that should only be built in the standalone configuration. To figure out whether or not it should be in a standalone configuration, v8 can create a file, build_overrides/v8.gni, that contains a variable, build_standalone_d8 = true. and import it (as import(“//build_overrides/v8.gni”) from its top-level BUILD.gn file.

Chromium, on the other hand, might not need to build d8, and so it would create its own build_overrides/v8.gni file, and in it set build_standalone_d8 = false.

The two files should define the same set of variables, but the values can vary as appropriate to the needs of the two different builds.

The build.gni file provides a way for projects to override defaults for variables used in //build itself (which we want to be shareable between projects).

TODO(crbug.com/588513): Ideally //build_overrides and, in particular, //build_overrides/build.gni should go away completely in favor of some mechanism that can re-use other required files like //.gn, so that we don't have to keep requiring projects to create a bunch of different files to use GN.