Move MetadataFrameSequence from third_party/spdy/core to gfe/gfe2/metadata.

This CL moves //third_party/spdy/core:metadata_extension_lib to
//gfe/gfe2/metadata:metadata_frame_sequence. With this move, this CL also
removes MetadataVisitor, which was unused outside of tests. The MetadataVisitor
tests are arguably covered by MetadataManager tests, e.g.:
  - MetadataExtensionTest.MetadataNotSupported -->
    MetadataManagerTest.MetadataNotSupported
  - MetadataExtensionTest.MetadataSupported -->
    MetadataManagerTest.MetadataSupported
  - MetadataExtensionTest.MetadataDeliveredToUnknownFrameCallbacks -->
    MetadataManagerTest.SetUp() [1]
  - MetadataExtensionTest.MetadataPayloadEndToEnd -->
    MetadataManagerTest.SendAndReceiveMetadata
  - MetadataExtensionTest.MetadataPayloadInterleaved -->
    MetadataManagerTest.ReceivedMetadataPayloadInterleaved

The net effect is some code removal, with less code that needs to be moved from
//third_party/spdy to third_party/http2.

#cleanup

[1]
http://google3/gfe/gfe2/metadata/metadata_manager_test.cc;l=210-224;rcl=565024527,
and I can add an explicit test if helpful

PiperOrigin-RevId: 599261755
6 files changed
tree: ea892710a10f203220e6f577cc317a7975867143
  1. build/
  2. depstool/
  3. quiche/
  4. .bazelrc
  5. .bazelversion
  6. BUILD.bazel
  7. CONTRIBUTING.md
  8. LICENSE
  9. README.md
  10. WHITESPACE
  11. WORKSPACE.bazel
README.md

QUICHE

QUICHE stands for QUIC, Http, Etc. It is Google‘s production-ready implementation of QUIC, HTTP/2, HTTP/3, and related protocols and tools. It powers Google’s servers, Chromium, Envoy, and other projects. It is actively developed and maintained.

There are two public QUICHE repositories. Either one may be used by embedders, as they are automatically kept in sync:

To embed QUICHE in your project, platform APIs need to be implemented and build files need to be created. Note that it is on the QUICHE team's roadmap to include default implementation for all platform APIs and to open-source build files. In the meanwhile, take a look at open source embedders like Chromium and Envoy to get started:

To contribute to QUICHE, follow instructions at CONTRIBUTING.md.

QUICHE is only supported on little-endian platforms.