Add bitmap tracing

Trace bitmap copy operations and add flow between writeToParcel and
createFromParcel.

Each parcel needs a unique identifier for flow id.  We generate the
parcel id by combining pid and an atomic counter.

Flag: EXEMPT - tracing only change
Test: Boot phone take trace
Bug: 369619160
Bug: 398625106
Change-Id: I240a67a092916658d6c697f22c57f5888e22146c