[//gpu] Move SII::MapSharedImage() to ClientSharedImage::Map()

All implementations are now identical and just use the GMB from
ClientSI, so this method can be on ClientSI itself. This CL moves the
method, updates all callers, and eliminates the no-longer-used SII
interface and its implementations.

Note that the ClientSI can outlive the ClientSII in the case where the
ClientSII is torn down before a client has called
DestroySharedImage(ClientSII). There is no particular harm from a
client calling ClientSI->Map() after that point, since ClientSI->Map()
accesses only the GMB. In the fullness of time, ClientSI will need to
know about its creating ClientSII, including being informed of its
destruction. Once we have that functionality in, we could also clear
out the GMB at that point.

Bug: 1500612
Change-Id: I528881d6c289d850daa1a4be5c551d1460c714b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5030455
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1230537}

• ash/fast_ink/fast_ink_host.cc[diff]
• ash/fast_ink/fast_ink_host.h[diff]
• ash/fast_ink/fast_ink_host_unittest.cc[diff]
• ash/fast_ink/view_tree_host_root_view_frame_factory.cc[diff]
• ash/rounded_display/rounded_display_frame_factory.cc[diff]
• cc/raster/one_copy_raster_buffer_provider.cc[diff]
• cc/raster/zero_copy_raster_buffer_provider.cc[diff]
• components/viz/test/test_context_provider.cc[diff]
• components/viz/test/test_context_provider.h[diff]
• gpu/command_buffer/client/client_shared_image.cc[diff]
• gpu/command_buffer/client/client_shared_image.h[diff]
• gpu/command_buffer/client/shared_image_interface.cc[diff]
• gpu/command_buffer/client/shared_image_interface.h[diff]
• gpu/command_buffer/service/shared_image_interface_in_process.cc[diff]
• gpu/command_buffer/service/shared_image_interface_in_process.h[diff]
• gpu/ipc/client/client_shared_image_interface.cc[diff]
• gpu/ipc/client/client_shared_image_interface.h[diff]
• third_party/blink/renderer/platform/graphics/canvas_resource.cc[diff]
• third_party/blink/renderer/platform/graphics/canvas_resource.h[diff]