arc: Use the MIME type returned by the container to handle content URLs

chrome/browser/chromeos/file_manager/filesystem_api_util.cc

Index: chrome/browser/chromeos/file_manager/filesystem_api_util.cc
diff --git a/chrome/browser/chromeos/file_manager/filesystem_api_util.cc b/chrome/browser/chromeos/file_manager/filesystem_api_util.cc
index ccf4a84df57d0050c8260f3578ca6e479fc0544e..8a435cb96cf9b0c10508a61e8192adbb4c78a52d 100644
--- a/chrome/browser/chromeos/file_manager/filesystem_api_util.cc
+++ b/chrome/browser/chromeos/file_manager/filesystem_api_util.cc
@@ -9,6 +9,9 @@
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
+#include "chrome/browser/chromeos/arc/arc_util.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.h"
+#include "chrome/browser/chromeos/arc/fileapi/arc_file_system_operation_runner.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/file_manager/app_id.h"
 #include "chrome/browser/chromeos/file_manager/fileapi_util.h"
@@ -16,6 +19,7 @@
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile.h"
+#include "components/arc/arc_service_manager.h"
 #include "components/drive/chromeos/file_system_interface.h"
 #include "components/drive/file_errors.h"
 #include "components/drive/file_system_core_util.h"
@@ -59,6 +63,19 @@ void GetMimeTypeAfterGetMetadataForProvidedFileSystem(
   callback.Run(true, *metadata->mime_type);
 }
 
+// Helper function used to implement GetNonNativeLocalPathMimeType. It passes
+// the returned mime type to the callback.
+void GetMimeTypeAfterGetMimeTypeForArcContentFileSystem(
+    const base::Callback<void(bool, const std::string&)>& callback,
+    const base::Optional<std::string>& mime_type) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  if (mime_type.has_value()) {
+    callback.Run(true, mime_type.value());
+  } else {
+    callback.Run(false, std::string());
+  }
+}
+
 // Helper function to converts a callback that takes boolean value to that takes
 // File::Error, by regarding FILE_OK as the only successful value.
 void BoolCallbackAsFileErrorCallback(
@@ -181,6 +198,23 @@ void GetNonNativeLocalPathMimeType(
     return;
   }
 
+  if (arc::IsArcAllowedForProfile(profile) &&
+      base::FilePath(arc::kContentFileSystemMountPointPath).IsParent(path)) {
+    GURL arc_url = arc::PathToArcUrl(path);
+    auto* runner = arc::ArcServiceManager::GetGlobalService<
+        arc::ArcFileSystemOperationRunner>();
+    if (!runner) {
+      content::BrowserThread::PostTask(
+          content::BrowserThread::UI, FROM_HERE,
+          base::BindOnce(callback, false, std::string()));
+      return;
+    }
+    runner->GetMimeType(
+        arc_url, base::Bind(&GetMimeTypeAfterGetMimeTypeForArcContentFileSystem,
+                            callback));
+    return;
+  }
+
   // We don't have a way to obtain metadata other than drive and FSP. Returns an
   // error with empty MIME type, that leads fallback guessing mime type from
   // file extensions.