Revert "skyshell: disable cache for now"

sky/services/oknet/src/org/domokit/oknet/NetworkServiceImpl.java

Index: sky/services/oknet/src/org/domokit/oknet/NetworkServiceImpl.java
diff --git a/sky/services/oknet/src/org/domokit/oknet/NetworkServiceImpl.java b/sky/services/oknet/src/org/domokit/oknet/NetworkServiceImpl.java
index ce30d856bad68eee5e211d1519262aab9a3726a1..f8b5b73d58bc021491e501d323e10a894dab85e2 100644
--- a/sky/services/oknet/src/org/domokit/oknet/NetworkServiceImpl.java
+++ b/sky/services/oknet/src/org/domokit/oknet/NetworkServiceImpl.java
@@ -45,9 +45,19 @@ public class NetworkServiceImpl implements NetworkService {
         if (sThreadPool == null)
             sThreadPool = Executors.newCachedThreadPool();
 
-        if (sClient == null)
+        if (sClient == null) {
             sClient = new OkHttpClient();
 
+            try {
+                int cacheSize = 10 * 1024 * 1024; // 10 MiB
+                File cacheDirectory = new File(context.getCacheDir(), "ok_http_cache");
+                Cache cache = new Cache(cacheDirectory, cacheSize);
+                sClient.setCache(cache);
+            } catch (IOException e) {
+                Log.e(TAG, "Unable to create HTTP cache", e);
+            }
+        }
+
         NetworkService.MANAGER.bind(this, pipe);
     }