Add .cache to gitignore. am: 79b1b0af2e am: d6d54b27f8
Add .cache to gitignore. am: 79b1b0af2e am: d6d54b27f8

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/1556083

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Id806dd6c21cdff6b9a335717bffda360b083bb4e

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto