Pass command line arguments onto platform apps which provide the right intent.

chrome/browser/extensions/platform_app_browsertest.cc

Index: chrome/browser/extensions/platform_app_browsertest.cc
diff --git a/chrome/browser/extensions/platform_app_browsertest.cc b/chrome/browser/extensions/platform_app_browsertest.cc
index 3aeac39a9f1de56ada32255e07dcb067dd0f81eb..a203a267a9f9f12f540367c75b02502d22b8253f 100644
--- a/chrome/browser/extensions/platform_app_browsertest.cc
+++ b/chrome/browser/extensions/platform_app_browsertest.cc
@@ -196,3 +196,11 @@ IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, DisallowStorage) {
 IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, MAYBE_WindowsApi) {
   ASSERT_TRUE(RunPlatformAppTest("platform_apps/windows_api")) << message_;
 }
+
+IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, DocumentEditor) {
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  FilePath test_doc(test_data_dir_.AppendASCII(
+      "platform_apps/document_editor/test.txt"));
+  command_line->AppendArg(test_doc.value());
+  ASSERT_TRUE(RunPlatformAppTest("platform_apps/document_editor")) << message_;
+}