Files app: Enable tests to run as JS modules

Enable all integration tests to run as JS modules.

I have hand selected some tests to continue to run as non-js-modules to
have some coverage in case we need to flip back to it.

Bug: 1133186
Change-Id: Iddb5b65bd82c62a5288e856bdd0ff5587f80ac24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641688Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845552}

chrome/browser/chromeos/file_manager/file_manager_browsertest_base.cc

@@ -740,6 +740,7 @@ std::ostream& operator<<(std::ostream& out,
   PRINT_IF_NOT_DEFAULT(tablet_mode)
   PRINT_IF_NOT_DEFAULT(zip)
   PRINT_IF_NOT_DEFAULT(zip_no_nacl)
+  PRINT_IF_NOT_DEFAULT(enable_js_modules)
 
 #undef PRINT_IF_NOT_DEFAULT
 
@@ -1715,6 +1716,12 @@ void FileManagerBrowserTestBase::SetUpCommandLine(
     disabled_features.push_back(ash::features::kTemporaryHoldingSpace);
   }
 
+  if (options.enable_js_modules) {
+    enabled_features.push_back(chromeos::features::kFilesJsModules);
+  } else {
+    disabled_features.push_back(chromeos::features::kFilesJsModules);
+  }
+
   if (command_line->HasSwitch("devtools-code-coverage") &&
       options.guest_mode != IN_INCOGNITO) {
     devtools_code_coverage_dir_ =

chrome/browser/chromeos/file_manager/file_manager_browsertest_base.h

@@ -111,6 +111,9 @@ class FileManagerBrowserTestBase : public content::DevToolsAgentHostObserver,
 
     // Whether test should enable holding space.
     bool enable_holding_space = false;
+
+    // Whether test should run Files app UI as JS modules.
+    bool enable_js_modules = true;
   };
 
  protected: