Update Dawn backend to ToT.  This is about 3 months of changes.

Remove optional param to SetIndexBuffer().
Update SetVertexBuffers -> SetVertexBuffer.
PipelineStageDescriptor -> ProgrammableStageDescriptor.
Update past generator changes, ring buffer changes, etc.
Add ErrorScopeTracker.cpp/.h to the build.
Add Vulkan MemoryResourceAllocator files.
Fix vertexShader ShaderStageDescriptor.
Fix spirv-cross include path.
TextureUsageBit -> TextureUsage, etc.
DawnErrorCallback fixes.
Removal of texture.CreateDefaultView.
Fix GL supported_extesions mumbo jumbo.
Update past ChromeOS change.
Add PassResourceUsageTracker.cpp/.h to build.
Add GLFormat.cpp/.h to build.
Add Extensions and Toggles to the build.
Add EncodingContext, AttachmentState to build.
Add RenderEncoderBase to Dawn build.
gn format dawn BUILD.gn, spirv-cross BUILD.gn.

Change-Id: I26538d63c93668647048814aad6ad456ae323679
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/248261
Commit-Queue: Stephen White <senorblanco@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
18 files changed