Vulkan: Propagate BufferData changes to shader storage buffer binding This CL adds context to the observer list of shader storage buffer. When BufferData is called on the current bound shader storage buffer, context gets notified and DIRTY_BIT_SHADER_STORAGE_BUFFER_BINDING gets set. Bug: b/195678877 Change-Id: Id8a5266942e33f0a834d7c57fdde75f57e93d347 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3076177 Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>