cc: Put context-loss tests in layer_tree_host_unittest_context.cc

cc/tiled_layer.cc

Index: cc/tiled_layer.cc
diff --git a/cc/tiled_layer.cc b/cc/tiled_layer.cc
index 5033a2d66bb6c781782f5b77cb89a050229e7cb0..d96ea6b972420c1b859243366071cadb48c10999 100644
--- a/cc/tiled_layer.cc
+++ b/cc/tiled_layer.cc
@@ -232,6 +232,14 @@ PrioritizedResourceManager* TiledLayer::resourceManager() const
     return layerTreeHost()->contentsTextureManager();
 }
 
+const PrioritizedResource* TiledLayer::resourceAtForTesting(int i, int j) const
+{
+    UpdatableTile* tile = tileAt(i, j);
+    if (!tile)
+        return 0;
+    return tile->managedResource();
+}
+
 void TiledLayer::setLayerTreeHost(LayerTreeHost* host)
 {
     if (host && host != layerTreeHost()) {