Vulkan: Add context flushing as OOM fallback * As a new fallback for out-of-memory errors, if an allocation results in device OOM, the context is flushed and the allocation is retried. * Functions related to buffer/image allocations now return a VkResult value instead of angle::Result, which will be bubbled up to a higher level for safer handling. * The OOM is no longer handled at the level where the allocation happens, but is moved up to the context. * Added two functions to ContextVk for allocating memory for images and buffer suballocations, which also include the fallback options. * initBufferAllocation(): Uses BufferHelper::initSuballocation() * initImageAllocation(): Uses ImageHelper::initMemory() * Moved initNonZeroMemory() out of the following functions: * BufferHelper::initSuballocation() * Moved to ContextVk::initBufferAllocation(). * ImageHelper::initMemory() * Moved to ContextVk::initImageAllocation(). * Also moved to new function: ImageHelper::initMemoryAndNonZeroFillIfNeeded(). This function replaced the rest of initMemory() usages outside initImageAllocation(). * New macros for memory allocation * VK_RESULT_TRY() * If the output of the command inside it is not VK_SUCCESS, it will return with the error result from the command. * VK_RESULT_CHECK() * If the output of the command inside it is not VK_SUCCESS, it will return with the input error. * Added a test in which allocation would fail due to too much pending garbage without the fix on some platforms. The test ends once there has been a submission. * New suite: UniformBufferMemoryTest * Added a similar test for flushing texture-related pending garbage. * New suite: Texture2DMemoryTestES3 Bug: b/280304441 Change-Id: I60248ce39eae80b5a8ffe4723d8a1c5641087f23 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4787949 Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Amirali Abdolrashidi <abdolrashidi@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>