android: Fix java launcher thread

content/browser/android/launcher_thread.cc

Index: content/browser/android/launcher_thread.cc
diff --git a/content/browser/android/launcher_thread.cc b/content/browser/android/launcher_thread.cc
index 2c59a2da7a5756000a98be34c925e8f93eb88a32..06a7f234fc1b039a275654446b0bcdab61d0cffe 100644
--- a/content/browser/android/launcher_thread.cc
+++ b/content/browser/android/launcher_thread.cc
@@ -19,7 +19,9 @@ base::MessageLoop* LauncherThread::GetMessageLoop() {
 
 LauncherThread::LauncherThread()
     : java_handler_thread_(Java_LauncherThread_getHandlerThread(
-          base::android::AttachCurrentThread())) {}
+          base::android::AttachCurrentThread())) {
+  java_handler_thread_.Start();
+}
 
 LauncherThread::~LauncherThread() {}