Rename GrAtlasedLayer to GrCachedLayer (since not all cached layers are atlased)

This is mainly a renaming CL but it does add a ref-counted ptr  to the backing GrTexture for non-atlased layers (the only kind working right now)

R=jvanverth@google.com

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/233703003

git-svn-id: http://skia.googlecode.com/svn/trunk@14152 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index d66006e..911ac5a 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -1988,7 +1988,7 @@
     SkDebugf("Need SaveLayers: ");
     for (int i = 0; i < gpuData->numSaveLayers(); ++i) {
         if (pullForward[i]) {
-            const GrAtlasedLayer* layer = fContext->getLayerCache()->findLayerOrCreate(picture, i);
+            const GrCachedLayer* layer = fContext->getLayerCache()->findLayerOrCreate(picture, i);
 
             SkDebugf("%d (%d), ", i, layer->layerID());
         }