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

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
===================================================================
--- src/gpu/SkGpuDevice.cpp	(revision 14136)
+++ src/gpu/SkGpuDevice.cpp	(working copy)
@@ -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());
         }