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>