Vulkan: Accumulate internal cache stats in renderer The CacheStats of all internal caches are accumulated by the renderer. In order to see the hit ratios of all caches, the following GN args must be enabled: is_debug = true angle_enable_perf_counter_output = true Bug: angleproject:5447 Test: Manual verification with angle_end2end_tests Change-Id: Iaca3249192e9e4e130d8291b7759c459d79b06ee Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2588430 Commit-Queue: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>