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Previously compositor supported YCbCr samplers only on Android and only
for external Vulkan images. On Fuchsia sysmem APIs use Vulkan I420
formats to return decoded images and so YCbCr samplers have to be used
to render them on the screen. In this CL:
 1. Updated VulkanImplementation::CreateImageFromGpuMemoryHandle() to
    make it possible to return YCbCr info.
 2. Added image_format in gpu::VulkanYCbCrInfo to remove the
    assumption YCbCr images are always external.
 3. ExternalVkImageBacking now bundles returned YCbCr info in
    GrVkImageInfo when wrapping in GrBackendTexture.
 4. SkiaOutputSurfaceImpl now passes image format when initializing
    GrVkYcbcrConversionInfo.
 5. Updated VulkanDeviceQueue and VulkanImplementationScenic to
    enable YCbCr sampler extension on Fuchsia.

Bug: 981022
Change-Id: I477ebf698d098bafefaadbf77dfa8d373f9ae076
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730311
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686649}