Merge "Call SF#processDisplayChangesLocked in testable SF" into main

    void commitTransactionsLocked(uint32_t transactionFlags) {

        Mutex::Autolock lock(mFlinger->mStateLock);

        ftl::FakeGuard guard(kMainThreadContext);

        mFlinger->processDisplayChangesLocked();

        mFlinger->commitTransactionsLocked(transactionFlags);

    }