IPC::PixelBufferReference is a redundant class in wrong software layer

[kkinnunen-apple]

7b1cf97

IPC::PixelBufferReference is a redundant class in wrong software layer
https://bugs.webkit.org/show_bug.cgi?id=241331

Reviewed by Simon Fraser.

Instead of a new class PixelBufferReference, the IPC messages should
just use Ref<PixelBuffer>.

Solves problems:
 - IPC::PixelBufferReference should not exist in IPC layer. PixelBuffer
is WebCore class.
 - IPC::PixelBufferReference is not a reference to a pixel buffer. It
is copying the pixel buffer data.
 - Allows more WebGL GPUP support code to be autogenerated.

* Source/WebKit/GPUProcess/graphics/RemoteGraphicsContextGL.cpp:
(WebKit::RemoteGraphicsContextGL::paintRenderingResultsToPixelBuffer): Deleted.
* Source/WebKit/GPUProcess/graphics/RemoteGraphicsContextGL.h:
* Source/WebKit/GPUProcess/graphics/RemoteGraphicsContextGL.messages.in:
* Source/WebKit/GPUProcess/graphics/RemoteGraphicsContextGLFunctionsGenerated.h:
(paintRenderingResultsToPixelBuffer):
* Source/WebKit/GPUProcess/graphics/RemoteRenderingBackend.cpp:
(WebKit::RemoteRenderingBackend::putPixelBufferForImageBuffer):
* Source/WebKit/GPUProcess/graphics/RemoteRenderingBackend.h:
* Source/WebKit/GPUProcess/graphics/RemoteRenderingBackend.messages.in:
* Source/WebKit/Platform/IPC/PixelBufferReference.h: Removed.
* Source/WebKit/Scripts/webkit/messages.py:
(types_that_cannot_be_forward_declared):
* Source/WebKit/Shared/WebCoreArgumentCoders.cpp:
(IPC::ArgumentCoder<PixelBuffer>::encode):
(IPC::ArgumentCoder<PixelBuffer>::decode):
* Source/WebKit/Shared/WebCoreArgumentCoders.h:
* Source/WebKit/WebKit.xcodeproj/project.pbxproj:
* Source/WebKit/WebProcess/GPU/graphics/RemoteGraphicsContextGLProxy.cpp:
(WebKit::RemoteGraphicsContextGLProxy::paintRenderingResultsToPixelBuffer): Deleted.
* Source/WebKit/WebProcess/GPU/graphics/RemoteGraphicsContextGLProxy.h:
* Source/WebKit/WebProcess/GPU/graphics/RemoteGraphicsContextGLProxyFunctionsGenerated.cpp:
(WebKit::RemoteGraphicsContextGLProxy::paintRenderingResultsToPixelBuffer):
* Source/WebKit/WebProcess/GPU/graphics/RemoteRenderingBackendProxy.cpp:
(WebKit::RemoteRenderingBackendProxy::putPixelBufferForImageBuffer):
* Tools/Scripts/generate-gpup-webgl:

Canonical link: https://commits.webkit.org/253512@main

[webkit-commit-queue]

Committed 253512@main (7b1cf97): https://commits.webkit.org/253512@main

Reviewed commits have been landed. Closing PR #3302 and removing active labels.