Creates BackgroundShell and uses it in test

mojo/shell/standalone/android/main.cc

Index: mojo/shell/standalone/android/main.cc
diff --git a/mojo/shell/standalone/android/main.cc b/mojo/shell/standalone/android/main.cc
index 9fffd84ee6c825d772fb0b4954026af8e597cbbc..6be9f8afffdeb9158ccb94c8c7db9b1759946518 100644
--- a/mojo/shell/standalone/android/main.cc
+++ b/mojo/shell/standalone/android/main.cc
@@ -14,6 +14,7 @@
 #include "base/debug/stack_trace.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
+#include "base/i18n/icu_util.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ -136,6 +137,8 @@ static void Init(JNIEnv* env,
   g_java_message_loop.Get().reset(new base::MessageLoopForUI);
   base::MessageLoopForUI::current()->Start();
 
+  CHECK(base::i18n::InitializeICU());
+
   shell_context->Init(shell_file_root);
   ConfigureAndroidServices(shell_context);