Revert^2 "hwui: remove FatVector"

Revert submission 10449863-revert-fatvector

Reason for revert: b/149254345

Original change (of introducing FatVector) was reverted as a stop-gap solution to fix the aforementioned bug.

The bug was caused by an ABI lock between Surface's definition (that changed with Region) and lib-imsvt prebuilt.

Enabling this change now as we have re-compiled the prebuilt with the change enabled. Doing that via a revert of the revert.

Reverted Changes:
I8ac66acb8:Revert "hwui: remove FatVector"
Ib60dbf3ef:Revert "libui: rewrite Region with FatVector"

Original changes:
I09dc2fddd:hwui: remove FatVector
I265c6c831:libui: rewrite Region with FatVector

bug: 149254345

Change-Id: I9fb5e8908434abb9a763992e922445a2dc37e865
diff --git a/libs/hwui/renderthread/RenderThread.cpp b/libs/hwui/renderthread/RenderThread.cpp
index cae3e3b..206b58f 100644
--- a/libs/hwui/renderthread/RenderThread.cpp
+++ b/libs/hwui/renderthread/RenderThread.cpp
@@ -27,7 +27,6 @@
 #include "pipeline/skia/SkiaOpenGLPipeline.h"
 #include "pipeline/skia/SkiaVulkanPipeline.h"
 #include "renderstate/RenderState.h"
-#include "utils/FatVector.h"
 #include "utils/TimeUtils.h"
 #include "utils/TraceUtils.h"
 
@@ -40,6 +39,8 @@
 #include <utils/Mutex.h>
 #include <thread>
 
+#include <ui/FatVector.h>
+
 namespace android {
 namespace uirenderer {
 namespace renderthread {