Using a custom array instead of std::vector speeds up the resource
manager. One reason is because calls to size() are implemented in many
implementations as a difference between two pointers. This sub size
implementations are slower than storing a simple size variable in a
custom class.

Also includes more inlining of hot spots functions.

Also includes a small unit test class for ResourceMap. And an unrelated
but small test fix for TextureLimisTest. Also a small unrelated fix for
a Transform Feedback test.

Increase the scores of the draw call perf test with texture and buffer
bindings and the buffer binding perf test.

Bug: angleproject:2763
Change-Id: I41c327987db27ac45e6a62579f01e1cdc22e396c
Reviewed-on: https://chromium-review.googlesource.com/1171510Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>