android: Fix java launcher thread

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 9b6275d08718b0a76e62990aa88fc9828b341ec6..3af4f47fce4470263f826efa02049c2d4ce8b1e9 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -1127,7 +1127,7 @@ int BrowserMainLoop::CreateThreads() {
       (*thread_to_start)
           .reset(message_loop ? new BrowserProcessSubThread(id, message_loop)
                               : new BrowserProcessSubThread(id));
-      if (!(*thread_to_start)->StartWithOptions(options))
+      if (!message_loop && !(*thread_to_start)->StartWithOptions(options))

[gab, 2017/04/13 15:39:12]

Ah I see, hadn't parsed that this wasn't about adding a conditional for the LOG
but rather preventing StartWithOptions(), add a comment above like:

// Start the thread if an existing |message_loop| wasn't provided.

[boliu, 2017/04/13 16:30:05]

Done.

         LOG(FATAL) << "Failed to start the browser thread: id == " << id;
     } else {
       scoped_refptr<base::SingleThreadTaskRunner> redirection_task_runner =