DO NOT MERGE: SurfaceControl: Ensure unused fields are zeroed

Otherwise we could leak uninitialized memory to
an untrusted process.

Bug: 214999987
Test: Existing tests pass
Change-Id: I87993fbb920b3af938a311e6afc15383d571823a
(cherry picked from commit c2cf02c17af0d7e5f58b8a17ecb9cfcc91a4d2eb)
(cherry picked from commit 34fe38b0c7ce6a47eaa2f328865858a2c7dac5e1)
Merged-In: I87993fbb920b3af938a311e6afc15383d571823a
2 files changed