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

src/core/SkMultiPictureDraw.cpp

Index: src/core/SkMultiPictureDraw.cpp
diff --git a/src/core/SkMultiPictureDraw.cpp b/src/core/SkMultiPictureDraw.cpp
index 4003808310e27682f80b00a3c110ce5ee7cdb788..672bd628b7c728220c667d0104bfcd4d183f00d3 100644
--- a/src/core/SkMultiPictureDraw.cpp
+++ b/src/core/SkMultiPictureDraw.cpp
@@ -116,6 +116,8 @@ void SkMultiPictureDraw::draw(bool flush) {
     // drawing the canvas that requires them.
     SkTDArray<GrHoistedLayer> atlasedNeedRendering, atlasedRecycled;
 
+    GrLayerHoister::Begin(context);
+
     for (int i = 0; i < count; ++i) {
         const DrawData& data = fGPUDrawData[i];
         // we only expect 1 context for all the canvases
@@ -199,9 +201,7 @@ void SkMultiPictureDraw::draw(bool flush) {
 #if !defined(SK_IGNORE_GPU_LAYER_HOISTING) && SK_SUPPORT_GPU
     GrLayerHoister::UnlockLayers(context, atlasedNeedRendering);
     GrLayerHoister::UnlockLayers(context, atlasedRecycled);
-#if !GR_CACHE_HOISTED_LAYERS
-    GrLayerHoister::PurgeCache(context);
-#endif
+    GrLayerHoister::End(context);
 #endif
 }