Sniff MIME type for files which have unknown extensions.

chrome/browser/apps/app_browsertest.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 "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "apps/common/api/app_runtime.h"
 #include "apps/launcher.h"
 #include "apps/ui/native_app_window.h"
 #include "base/bind.h"
@@ skipping 634 matching lines @@
 }
 
 // Tests that no launch data is sent through if the platform app does not
 // provide an intent.
 IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, LaunchWithNoIntent) {
   SetCommandLineArg(kTestFilePath);
   ASSERT_TRUE(RunPlatformAppTest("platform_apps/launch_no_intent"))
       << message_;
 }
 
+// Tests that launch data is sent through when the file has unknown extension
+// but the MIME type can be sniffed and the sniffed type matches.
+IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, LaunchWithSniffableType) {
+  SetCommandLineArg("platform_apps/launch_files/test.unknownextension");
+  ASSERT_TRUE(RunPlatformAppTest(
+      "platform_apps/launch_file_by_extension_and_type")) << message_;
+}
+
 // Tests that launch data is sent through with the MIME type set to
 // application/octet-stream if the file MIME type cannot be read.
 IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, LaunchNoType) {
-  SetCommandLineArg("platform_apps/launch_files/test.unknownextension");
+  SetCommandLineArg("platform_apps/launch_files/test_binary.unknownextension");

[fukino, 2014/04/15 07:29:00]

To force the MIME type to fall back to application/octet-stream,
test_binary.unknowextension is used here. This is a binary file whose content
was generated by random number generator.

   ASSERT_TRUE(RunPlatformAppTest(
       "platform_apps/launch_application_octet_stream")) << message_;
 }
 
 // Tests that no launch data is sent through if the file does not exist.
 IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, LaunchNoFile) {
   SetCommandLineArg("platform_apps/launch_files/doesnotexist.txt");
   ASSERT_TRUE(RunPlatformAppTest("platform_apps/launch_invalid"))
       << message_;
 }
@@ skipping 655 matching lines @@
 
     ExtensionApiTest::ResultCatcher result_catcher;
 
     ASSERT_TRUE(launched_listener.WaitUntilSatisfied());
 
     EXPECT_TRUE(result_catcher.GetNextResult());
   }
 }
 
 }  // namespace extensions