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

src/gpu/GrLayerHoister.cpp

Index: src/gpu/GrLayerHoister.cpp
diff --git a/src/gpu/GrLayerHoister.cpp b/src/gpu/GrLayerHoister.cpp
index 2bf1abb5fdb3618debdac00385c1d72cd1d35783..004e4d0e6eb38ab190e6d16a402b0e5d1c78d48f 100644
--- a/src/gpu/GrLayerHoister.cpp
+++ b/src/gpu/GrLayerHoister.cpp
@@ -322,7 +322,7 @@ void GrLayerHoister::FilterLayer(GrContext* context,
     }
 
     SkIRect newRect = SkIRect::MakeWH(filteredBitmap.width(), filteredBitmap.height());
-    layer->setTexture(filteredBitmap.getTexture(), newRect);
+    layer->setTexture(filteredBitmap.getTexture(), newRect, false);
     layer->setOffset(offset);
 }
 
@@ -380,13 +380,22 @@ void GrLayerHoister::UnlockLayers(GrContext* context,
     SkDEBUGCODE(layerCache->validate();)
 }
 
-void GrLayerHoister::PurgeCache(GrContext* context) {
-#if !GR_CACHE_HOISTED_LAYERS
+void GrLayerHoister::Begin(GrContext* context) {
+    GrLayerCache* layerCache = context->getLayerCache();
+
+    layerCache->begin();
+}
+
+void GrLayerHoister::End(GrContext* context) {
     GrLayerCache* layerCache = context->getLayerCache();
 
+#if !GR_CACHE_HOISTED_LAYERS
+
     // This code completely clears out the atlas. It is required when
     // caching is disabled so the atlas doesn't fill up and force more
     // free floating layers
     layerCache->purgeAll();
 #endif
+
+    layerCache->end();
 }