Merge "Add caching mechanism to speed up midi file reading speed." am: 145a0becf0 am: be670f474b am: ce9bfa26cb

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1429788

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ifbe6f3a0ea8d71b632680be9e784d251e0e67f87