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The Fuchsia platforms relies on a number of Vulkan extensions that have not been upstreamed to Khronos yet, and thus are not part of the official Vulkan headers (i.e. <vulkan/vulkan.h>). This CL adds a new header under src/common/ that contains these declarations, extracted from the Fuchsia source tree, and ensures they are included automatically from <common/vulkan_platform.h> This is necessary to support certain features when building Dawn on Fuchsia. IMPORTANT NOTE: Some of the things declared in this header will change once everything is upstreamed, which will require updating the source code using them. For example, VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_TEMP_ZIRCON_EVENT_BIT_FUCHSIA Will likely be renamed officially as: VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_ZIRCON_EVENT_BIT And will be assigned a new value by Khronos. BUG=dawn:221 Change-Id: If88a1dd06083a01d7b34b5cf5ab93f4e3f3681eb Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/10940 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Austin Eng <enga@chromium.org> Commit-Queue: David Turner <digit@google.com>