Recycle OffscreenBuffers

Change-Id: Ia2e219026f211a5308ecf8209c5f986bb888aadd
diff --git a/libs/hwui/renderstate/RenderState.h b/libs/hwui/renderstate/RenderState.h
index 3cda170..dcd5ea6 100644
--- a/libs/hwui/renderstate/RenderState.h
+++ b/libs/hwui/renderstate/RenderState.h
@@ -21,6 +21,7 @@
 #include "Glop.h"
 #include "renderstate/Blend.h"
 #include "renderstate/MeshState.h"
+#include "renderstate/OffscreenBufferPool.h"
 #include "renderstate/PixelBufferState.h"
 #include "renderstate/Scissor.h"
 #include "renderstate/Stencil.h"
@@ -56,6 +57,8 @@
     void onGLContextCreated();
     void onGLContextDestroyed();
 
+    void flush(Caches::FlushMode flushMode);
+
     void setViewport(GLsizei width, GLsizei height);
     void getViewport(GLsizei* outWidth, GLsizei* outHeight);
 
@@ -97,6 +100,8 @@
     Scissor& scissor() { return *mScissor; }
     Stencil& stencil() { return *mStencil; }
 
+    OffscreenBufferPool& layerPool() { return mLayerPool; }
+
     void dump();
 
 private:
@@ -116,6 +121,8 @@
     Scissor* mScissor = nullptr;
     Stencil* mStencil = nullptr;
 
+    OffscreenBufferPool mLayerPool;
+
     AssetAtlas mAssetAtlas;
     std::set<Layer*> mActiveLayers;
     std::set<renderthread::CanvasContext*> mRegisteredContexts;