diff -r 000000000000 -r 6474c204b198 mobile/android/base/background/common/log/writers/StringLogWriter.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/background/common/log/writers/StringLogWriter.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.background.common.log.writers;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+public class StringLogWriter extends LogWriter {
+  protected final StringWriter sw;
+  protected final PrintLogWriter inner;
+
+  public StringLogWriter() {
+    sw = new StringWriter();
+    inner = new PrintLogWriter(new PrintWriter(sw));
+  }
+
+  public String toString() {
+    return sw.toString();
+  }
+
+  @Override
+  public boolean shouldLogVerbose(String tag) {
+    return true;
+  }
+
+  public void error(String tag, String message, Throwable error) {
+    inner.error(tag, message, error);
+  }
+
+  public void warn(String tag, String message, Throwable error) {
+    inner.warn(tag, message, error);
+  }
+
+  public void info(String tag, String message, Throwable error) {
+    inner.info(tag, message, error);
+  }
+
+  public void debug(String tag, String message, Throwable error) {
+    inner.debug(tag, message, error);
+  }
+
+  public void trace(String tag, String message, Throwable error) {
+    inner.trace(tag, message, error);
+  }
+
+  public void close() {
+    inner.close();
+  }
+}