Initialize command line arguments for Mojo apptests.

mojo/services/html_viewer/ax_provider_apptest.cc

 // Copyright 2015 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 "base/bind.h"
+#include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/test_timeouts.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/application/application_test_base.h"
 #include "net/test/spawned_test_server/spawned_test_server.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/mojo_services/src/accessibility/public/interfaces/accessibility.mojom.h"
 
 namespace mojo {
@@ skipping 36 matching lines @@
       return true;
   }
   return false;
 }
 
 }  // namespace
 
 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,
       base::FilePath(FILE_PATH_LITERAL("net/data")));
   ASSERT_TRUE(server.Start());
 
   // Connect to the URL through the mojo:html_viewer content handler.
   const uint16_t assigned_port = server.host_port_pair().port();
   ApplicationConnection* connection = application_impl()->ConnectToApplication(
       base::StringPrintf("http://127.0.0.1:%u/files/test.html", assigned_port));
 
   // Connect to the AxProvider of the HTML document and get the AxTree.
   AxProviderPtr ax_provider;
   connection->ConnectToService(&ax_provider);
   Array<AxNodePtr> ax_tree;
   ax_provider->GetTree([&ax_tree](Array<AxNodePtr> tree) {
                          ax_tree = tree.Pass();
                          QuitRunLoop();
                        });
   ASSERT_TRUE(DoRunLoopWithTimeout());
 
   EXPECT_TRUE(AxTreeContainsText(ax_tree, "Hello "));
   EXPECT_TRUE(AxTreeContainsText(ax_tree, "World!"));
   EXPECT_FALSE(AxTreeContainsText(ax_tree, "foo"));
 }
 
 }  // namespace mojo