Initialize command line arguments for Mojo apptests.

mojo/services/html_viewer/ax_provider_apptest.cc

Index: mojo/services/html_viewer/ax_provider_apptest.cc
diff --git a/mojo/services/html_viewer/ax_provider_apptest.cc b/mojo/services/html_viewer/ax_provider_apptest.cc
index 29dc5016e11018b3ad2e3c8ec3c69232b7b4bc08..0eae932151dbf73e963ea90fd92350e8cfc52db1 100644
--- a/mojo/services/html_viewer/ax_provider_apptest.cc
+++ b/mojo/services/html_viewer/ax_provider_apptest.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "base/bind.h"
+#include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/test_timeouts.h"
@@ -59,6 +60,12 @@ bool AxTreeContainsText(const Array<AxNodePtr>& tree, const String& text) {
 typedef test::ApplicationTestBase AXProviderTest;
 
 TEST_F(AXProviderTest, HelloWorld) {
+  printf("MSW Commandline: %s\n", base::CommandLine::ForCurrentProcess()->GetCommandLineString().c_str());
+  printf("MSW application impl Commandline args: ");
+  for (auto& arg : application_impl()->args())
+    printf("%s ", arg.c_str());
+  printf("\n");
+
   // Start a test server for net/data/test.html access.
   net::SpawnedTestServer server(
       net::SpawnedTestServer::TYPE_HTTP, net::SpawnedTestServer::kLocalhost,