Make --wait-for-debugger work for mandoline launcher process.

mojo/runner/android/main.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/runner/android/main.h"
 
 #include "base/android/fifo_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
@@ skipping 138 matching lines @@
   std::vector<std::string> parameters;
   parameters.push_back(
       base::android::ConvertJavaStringToUTF8(env, mojo_shell_path));
   base::android::AppendJavaStringArrayToStringVector(env, jparameters,
                                                      &parameters);
   base::CommandLine::Init(0, nullptr);
   base::CommandLine::ForCurrentProcess()->InitFromArgv(parameters);
   g_shell_runner.Get().reset(new MojoShellRunner(parameters));
 
   InitializeLogging();
+  mojo::runner::WaitForDebuggerIfNecessary();
 
   InitializeRedirection();
 
   // We want ~MessageLoop to happen prior to ~Context. Initializing
   // LazyInstances is akin to stack-allocating objects; their destructors
   // will be invoked first-in-last-out.
   Context* shell_context = new Context();
   shell_context->SetShellFileRoot(base::FilePath(
       base::android::ConvertJavaStringToUTF8(env, j_local_apps_directory)));
   g_context.Get().reset(shell_context);
@@ skipping 33 matching lines @@
 }
 
 }  // namespace runner
 }  // namespace mojo
 
 // TODO(vtl): Even though main() should never be called, mojo_shell fails to
 // link without it. Figure out if we can avoid this.
 int main(int argc, char** argv) {
   NOTREACHED();
 }