SF: Move TransactionStart from VsyncModulator to Scheduler

This is part of go/surface-flinger-scheduler.

Test: SF tests pass.
Change-Id: I45872aeb67603e15f1d5080d0b9440bc986579e4
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index a0f7c75..19dcee7 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -523,7 +523,7 @@
     uint32_t peekTransactionFlags();
     // Can only be called from the main thread or with mStateLock held
     uint32_t setTransactionFlags(uint32_t flags);
-    uint32_t setTransactionFlags(uint32_t flags, VSyncModulator::TransactionStart transactionStart);
+    uint32_t setTransactionFlags(uint32_t flags, Scheduler::TransactionStart transactionStart);
     void commitTransaction();
     bool containsAnyInvalidClientState(const Vector<ComposerState>& states);
     uint32_t setClientStateLocked(const ComposerState& composerState);