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base/android/java/src/org/chromium/base/ThreadUtils.java

Index: base/android/java/src/org/chromium/base/ThreadUtils.java
diff --git a/base/android/java/src/org/chromium/base/ThreadUtils.java b/base/android/java/src/org/chromium/base/ThreadUtils.java
index f95d9ac8cde3238be0a76cb23548a347cac22dc2..dbad59d093fa695f43c060bc1e93873a95295761 100644
--- a/base/android/java/src/org/chromium/base/ThreadUtils.java
+++ b/base/android/java/src/org/chromium/base/ThreadUtils.java
@@ -34,6 +34,11 @@ public class ThreadUtils {
     @VisibleForTesting
     public static void setUiThread(Looper looper) {
         synchronized (sLock) {
+            if (looper == null) {
+                // Used to reset the looper after tests.
+                sUiThreadHandler = null;
+                return;
+            }
             if (sUiThreadHandler != null && sUiThreadHandler.getLooper() != looper) {
                 throw new RuntimeException("UI thread looper is already set to "
                         + sUiThreadHandler.getLooper() + " (Main thread looper is "