[Impeller] Implement YUV texture import and sampling for video player frames.

This patch rounds out support for importing Android Hardware Buffers as Vulkan
images and sampling from them.

Not Android Hardware Buffers are in formats that Vulkan (let alone Impeller)
understands. Some YUV textures have formats with no equivalent `vk::Format` enum
and need extra information on how to sample from them.

This patch adds support for correctly importing and sampling from such formats.

There are severe restrictions on how sampling from such external formats works.
For one, it isn’t possible to assign a combined image sampler in the render
pass. The pipeline itself needs to be rebuilt to reference a specially created
immutable sampler. This immutable sampler is a combination of the usual
information present in an Impeller SamplerDescriptor as well as a custom
“conversion” object obtained while importing the Android Hardware Buffer.

There is no way to predict what conversion object will be necessary ahead of
time as this will depend on the source of the Android Hardware Buffers and is
likely different for different video feeds, camera sources, and other Android
Hardware Buffer texture sources.

To handle this uncertainty, a new pipeline variant with a JIT determined
immutable sampler will be hashed and cached before being used in a render pass.
The number of pipeline variants created just-in-time will depend on the number
of sampler variants used in the render pass to sample from wrapped Image. For
instance, specifying a sampler with a different address mode will likely result
in a new pipeline variant being created.

In most cases however, there will just be one or two additional pipeline
variants per application. Impellers sampler diversity is very low with most
samplers being the usual NN samplers. It may be possible to preload even this
pipeline by trying known conversions. As said previously, there can only be a
handful of these conversions.

More restrictions on sampling from such images includes being limited to
`VK_FILTER_LINEAR` without additional format and extension wrangling and
performance penalties.

Fixes flutter/flutter#142082.

Author: chinmaygarde

ci/licenses_golden/licenses_flutter

@@ -35316,6 +35316,10 @@ ORIGIN: ../../../flutter/impeller/renderer/backend/vulkan/vertex_descriptor_vk.h
 ORIGIN: ../../../flutter/impeller/renderer/backend/vulkan/vk.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/renderer/backend/vulkan/vma.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/renderer/backend/vulkan/vma.h + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/renderer/backend/vulkan/yuv_conversion_library_vk.cc + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/renderer/backend/vulkan/yuv_conversion_library_vk.h + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/renderer/backend/vulkan/yuv_conversion_vk.cc + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/impeller/renderer/backend/vulkan/yuv_conversion_vk.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/renderer/blit_command.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/renderer/blit_command.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/renderer/blit_pass.cc + ../../../flutter/LICENSE
@@ -38163,6 +38167,10 @@ FILE: ../../../flutter/impeller/renderer/backend/vulkan/vertex_descriptor_vk.h
 FILE: ../../../flutter/impeller/renderer/backend/vulkan/vk.h
 FILE: ../../../flutter/impeller/renderer/backend/vulkan/vma.cc
 FILE: ../../../flutter/impeller/renderer/backend/vulkan/vma.h
+FILE: ../../../flutter/impeller/renderer/backend/vulkan/yuv_conversion_library_vk.cc
+FILE: ../../../flutter/impeller/renderer/backend/vulkan/yuv_conversion_library_vk.h
+FILE: ../../../flutter/impeller/renderer/backend/vulkan/yuv_conversion_vk.cc
+FILE: ../../../flutter/impeller/renderer/backend/vulkan/yuv_conversion_vk.h
 FILE: ../../../flutter/impeller/renderer/blit_command.cc
 FILE: ../../../flutter/impeller/renderer/blit_command.h
 FILE: ../../../flutter/impeller/renderer/blit_pass.cc

impeller/renderer/backend/vulkan/BUILD.gn

@@ -115,6 +115,10 @@ impeller_component("vulkan") {
     "vk.h",
     "vma.cc",
     "vma.h",
+    "yuv_conversion_library_vk.cc",
+    "yuv_conversion_library_vk.h",
+    "yuv_conversion_vk.cc",
+    "yuv_conversion_vk.h",
   ]
 
   public_deps = [