Revert "Use flag "pdf-use-skia-renderer" to switch PDF viewer's renderer"

This reverts commit ba504e872bf30ac4d253f0ee082b87ec63bfba33.

Reason for revert: Pixel tests failing on Mac:
https://ci.chromium.org/ui/p/chromium/builders/ci/mac12-arm64-rel-tests/3703/test-results?q=ExactID%3Aninja%3A%2F%2Fpdf%3Apdf_unittests%2FPDFiumPageThumbnailTest.GenerateThumbnail%2FAll.1+VHash%3Ae1e83050ba88b6e6

Original change's description:
> Use flag "pdf-use-skia-renderer" to switch PDF viewer's renderer
>
> Link flag "pdf-use-skia-renderer" with PDFiumEngine so that it can
> actually switch the renderer type for the PDF viewer upon
> initialization.
>
> This CL also changes PDFiumTestBase and tests derived from it into
> parameterized tests so that they can be tested with Skia renderer
> enabled:
> - For the tests which involve image rendering results comparison, add
>   the Skia expectations for them.
> - Test PDFiumPageImageDataTest.ImageData is currently skipped because
>   it crashes when Skia renderer is in use.
>
> Bug: 1379872
> Change-Id: I90d69e8a34e607dc9a049baf9c46d81569976f16
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4000168
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Reviewed-by: Lei Zhang <thestig@chromium.org>
> Commit-Queue: Nigi <nigi@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1068688}

Bug: 1379872, 1382605
Change-Id: Ic2a83ba9d13a3577e5c8f6177c7e7f8d318e93a8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4014220
Auto-Submit: Alan Cutter <alancutter@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Alan Cutter <alancutter@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1068917}
NOKEYCHECK=True
GitOrigin-RevId: c7d9b1208f52256f9167dab5c93350d10de1986c
1 file changed
tree: 44c079c24b4e579cfceb1aa7e0bfb9dad95f6780
  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_validation_layers.gni
  19. 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.