auto import from //depot/cupcake/@135843
diff --git a/test-runner/android/test/IsolatedContext.java b/test-runner/android/test/IsolatedContext.java
new file mode 100644
index 0000000..2866666
--- /dev/null
+++ b/test-runner/android/test/IsolatedContext.java
@@ -0,0 +1,85 @@
+package android.test;
+
+import com.google.android.collect.Lists;
+
+import android.content.ContextWrapper;
+import android.content.ContentResolver;
+import android.content.Intent;
+import android.content.Context;
+import android.content.ServiceConnection;
+import android.content.BroadcastReceiver;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+
+import java.util.List;
+
+/**
+     * A mock context which prevents its users from talking to the rest of the device while
+ * stubbing enough methods to satify code that tries to talk to other packages.
+ */
+public class IsolatedContext extends ContextWrapper {
+
+    private ContentResolver mResolver;
+
+    private List<Intent> mBroadcastIntents = Lists.newArrayList();
+
+    public IsolatedContext(
+            ContentResolver resolver, Context targetContext) {
+        super(targetContext);
+        mResolver = resolver;
+    }
+
+    /** Returns the list of intents that were broadcast since the last call to this method. */
+    public List<Intent> getAndClearBroadcastIntents() {
+        List<Intent> intents = mBroadcastIntents;
+        mBroadcastIntents = Lists.newArrayList();
+        return intents;
+    }
+
+    @Override
+    public ContentResolver getContentResolver() {
+        // We need to return the real resolver so that MailEngine.makeRight can get to the
+        // subscribed feeds provider. TODO: mock out subscribed feeds too.
+        return mResolver;
+    }
+
+    @Override
+    public boolean bindService(Intent service, ServiceConnection conn, int flags) {
+        return false;
+    }
+
+    @Override
+    public Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter) {
+        return null;
+    }
+
+    @Override
+    public void sendBroadcast(Intent intent) {
+        mBroadcastIntents.add(intent);
+    }
+
+    @Override
+    public void sendOrderedBroadcast(Intent intent, String receiverPermission) {
+        mBroadcastIntents.add(intent);
+    }
+
+    @Override
+    public int checkUriPermission(
+            Uri uri, String readPermission, String writePermission, int pid,
+            int uid, int modeFlags) {
+        return PackageManager.PERMISSION_GRANTED;
+    }
+
+    @Override
+    public int checkUriPermission(Uri uri, int pid, int uid, int modeFlags) {
+        return PackageManager.PERMISSION_GRANTED;
+    }
+
+    @Override
+    public Object getSystemService(String name) {
+        // No services exist in this context.
+        return null;
+    }
+
+}