Revert "Use renderengine::drawLayers api everywhere."

This reverts commit 0f7148365cfa405e8ed802b33c0e2a7b790fcf42.

Reason for revert: b/123878751, preparing while i investigate

Bug: 123878751
Test: bug no longer repros
Change-Id: I6c77427f0c113f96b68aec479ccec52b0bbb2c6b
diff --git a/services/surfaceflinger/BufferLayer.h b/services/surfaceflinger/BufferLayer.h
index d0c1b13..8158d6c 100644
--- a/services/surfaceflinger/BufferLayer.h
+++ b/services/surfaceflinger/BufferLayer.h
@@ -22,7 +22,6 @@
 
 #include <gui/ISurfaceComposerClient.h>
 #include <gui/LayerState.h>
-#include <renderengine/Image.h>
 #include <renderengine/Mesh.h>
 #include <renderengine/Texture.h>
 #include <system/window.h> // For NATIVE_WINDOW_SCALING_MODE_FREEZE
@@ -78,6 +77,10 @@
     // isFixedSize - true if content has a fixed size
     bool isFixedSize() const override;
 
+    // onDraw - draws the surface.
+    void onDraw(const RenderArea& renderArea, const Region& clip,
+                bool useIdentityTransform) override;
+
     bool isHdrY410() const override;
 
     void setPerFrameData(DisplayId displayId, const ui::Transform& transform, const Rect& viewport,
@@ -165,19 +168,13 @@
 
     bool mRefreshPending{false};
 
-    // Returns true if, when drawing the active buffer during gpu compositon, we
-    // should use a cached buffer or not.
-    virtual bool useCachedBufferForClientComposition() const = 0;
-
-    // prepareClientLayer - constructs a RenderEngine layer for GPU composition.
-    bool prepareClientLayer(const RenderArea& renderArea, const Region& clip,
-                            bool useIdentityTransform, Region& clearRegion,
-                            renderengine::LayerSettings& layer);
-
 private:
     // Returns true if this layer requires filtering
     bool needsFiltering() const;
 
+    // drawing
+    void drawWithOpenGL(const RenderArea& renderArea, bool useIdentityTransform) const;
+
     uint64_t getHeadFrameNumber() const;
 
     uint32_t mCurrentScalingMode{NATIVE_WINDOW_SCALING_MODE_FREEZE};
@@ -185,6 +182,9 @@
     // main thread.
     bool mBufferLatched{false}; // TODO: Use mActiveBuffer?
 
+    // The texture used to draw the layer in GLES composition mode
+    mutable renderengine::Texture mTexture;
+
     Rect getBufferSize(const State& s) const override;
 
     std::shared_ptr<compositionengine::Layer> mCompositionLayer;