Stop preserving mtimes on files app copies.

Bug: 523292
Change-Id: I24c947f4d33e779ff5b278d855c262cdea87dc3e
Reviewed-on: https://chromium-review.googlesource.com/c/1347639Reviewed-by: Stuart Langley <slangley@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610302}

chrome/browser/chromeos/extensions/file_manager/private_api_file_system.cc

@@ -214,7 +214,7 @@ storage::FileSystemOperationRunner::OperationID StartCopyOnIOThread(
       new storage::FileSystemOperationRunner::OperationID;
   *operation_id = file_system_context->operation_runner()->Copy(
       source_url, destination_url,
-      storage::FileSystemOperation::OPTION_PRESERVE_LAST_MODIFIED,
+      storage::FileSystemOperation::OPTION_NONE,
       storage::FileSystemOperation::ERROR_BEHAVIOR_ABORT,
       base::Bind(&OnCopyProgress, profile_id, base::Unretained(operation_id)),
       base::Bind(&OnCopyCompleted, profile_id, base::Owned(operation_id),

components/drive/service/fake_drive_service.cc

@@ -890,6 +890,10 @@ CancelCallback FakeDriveService::CopyResource(
   if (!last_modified.is_null()) {
     new_file->set_modified_date(last_modified);
     new_file->set_modified_by_me_date(last_modified);
+  } else {
+    auto now = base::Time::Now();
+    new_file->set_modified_date(now);
+    new_file->set_modified_by_me_date(now);
   }
 
   AddNewChangestamp(new_change, new_file->team_drive_id());

ui/file_manager/integration_tests/file_manager/keyboard_operations.js

@@ -98,6 +98,12 @@ function keyboardCopy(path) {
         [['world (1).ogv', '59 KB', 'OGG video']]);
     return remoteCall.waitForFiles(
         appId, expectedEntryRows, {ignoreLastModifiedTime: true});
+  }).then(() => {
+    return remoteCall.callRemoteTestUtil(
+        'getFileList', appId, []);
+  }).then(function(files) {
+    // The mtimes should not match.
+    chrome.test.assertTrue(files[0][3] != files[1][3], files[1][3]);
   });
 }