Yet more layer tracking logging

 Bug: 17208461

Change-Id: I55e7d0921eb565867e966d68b798b7b92c391b55
diff --git a/libs/hwui/renderthread/CanvasContext.h b/libs/hwui/renderthread/CanvasContext.h
index 5984fd0..2460f6b8 100644
--- a/libs/hwui/renderthread/CanvasContext.h
+++ b/libs/hwui/renderthread/CanvasContext.h
@@ -42,6 +42,7 @@
 class OpenGLRenderer;
 class Rect;
 class Layer;
+class RenderState;
 
 namespace renderthread {
 
@@ -95,6 +96,9 @@
 
 private:
     friend class RegisterFrameCallbackTask;
+    // TODO: Replace with something better for layer & other GL object
+    // lifecycle tracking
+    friend class android::uirenderer::RenderState;
 
     void setSurface(ANativeWindow* window);
     void swapBuffers();