Revert "Revert "Add ExternalTexture class into RenderEngine inte..."

Revert submission 14199598-revert-14086921-renderengine-external-tex-QJNBWQMQEU

Reason for revert: Prepare for relanding
Reverted Changes:
I01e65a7f4:Revert "Update WaylandRenderSurface to accomodate ...
I7d58118c1:Revert "Update Readback VTS to align with RenderEn...
I1501890f4:Revert "Add ExternalTexture class into RenderEngin...

Added the following fixes:
1. CachedSet renders to intermediate texture variable rather than
mTexture directly, since mTexture is not guaranteed to be nonnull.
2. Add null check when setting new buffer in BLAST.

Bug: 185524947
Bug: 180767535
Test: builds, boots
Test: librenderengine_test
Change-Id: I52ea82e24336b496d996bbe3e445db0affe1abb8
diff --git a/services/surfaceflinger/BufferStateLayer.h b/services/surfaceflinger/BufferStateLayer.h
index 24e0ad2..4171092 100644
--- a/services/surfaceflinger/BufferStateLayer.h
+++ b/services/surfaceflinger/BufferStateLayer.h
@@ -62,9 +62,9 @@
     bool setTransform(uint32_t transform) override;
     bool setTransformToDisplayInverse(bool transformToDisplayInverse) override;
     bool setCrop(const Rect& crop) override;
-    bool setBuffer(const sp<GraphicBuffer>& buffer, const sp<Fence>& acquireFence, nsecs_t postTime,
-                   nsecs_t desiredPresentTime, bool isAutoTimestamp,
-                   const client_cache_t& clientCacheId, uint64_t frameNumber,
+    bool setBuffer(const std::shared_ptr<renderengine::ExternalTexture>& buffer,
+                   const sp<Fence>& acquireFence, nsecs_t postTime, nsecs_t desiredPresentTime,
+                   bool isAutoTimestamp, const client_cache_t& clientCacheId, uint64_t frameNumber,
                    std::optional<nsecs_t> dequeueTime, const FrameTimelineInfo& info,
                    const sp<ITransactionCompletedListener>& transactionListener) override;
     bool setAcquireFence(const sp<Fence>& fence) override;
@@ -100,7 +100,7 @@
 
     // See mPendingBufferTransactions
     void decrementPendingBufferCount();
-    void bufferMayChange(sp<GraphicBuffer>& newBuffer) override;
+    void bufferMayChange(const sp<GraphicBuffer>& newBuffer) override;
     std::atomic<int32_t>* getPendingBufferCounter() override { return &mPendingBufferTransactions; }
     std::string getPendingBufferCounterName() override { return mBlastTransactionName; }