Update Layer Hoisting to store its atlas texture in the resource cache

src/gpu/GrLayerHoister.h

Index: src/gpu/GrLayerHoister.h
diff --git a/src/gpu/GrLayerHoister.h b/src/gpu/GrLayerHoister.h
index f30c53c0386e8bec8374b0f477c3fdb63c16fe6d..13cac5173ab98aec8e5ca1233b4ec78b5a31802d 100644
--- a/src/gpu/GrLayerHoister.h
+++ b/src/gpu/GrLayerHoister.h
@@ -33,6 +33,13 @@ public:
 //  UnlockLayers should be called once to allow the texture resources to be recycled
 class GrLayerHoister {
 public:
+    /** Attempt to reattach layers that may have been atlased in the past
+     */
+    static void Begin(GrContext* context);
+
+    /** Release cache resources
+     */
+    static void End(GrContext* context);
 
     /** Find the layers in 'topLevelPicture' that can be atlased. Note that the discovered
         layers can be inside nested sub-pictures.