Change butter bar message depending on the type of operation and the number of files.

chrome/browser/resources/file_manager/js/mock_chrome.js

Index: chrome/browser/resources/file_manager/js/mock_chrome.js
diff --git a/chrome/browser/resources/file_manager/js/mock_chrome.js b/chrome/browser/resources/file_manager/js/mock_chrome.js
index 3aae77b9bf1507d741b3014df4c8b5ebae61d209..1449cb73c5dad1ceb25e6ac691afa94a0593ba1a 100644
--- a/chrome/browser/resources/file_manager/js/mock_chrome.js
+++ b/chrome/browser/resources/file_manager/js/mock_chrome.js
@@ -583,11 +583,23 @@ chrome.fileBrowserPrivate = {
       GSHEET_DOCUMENT_FILE_TYPE: 'Google spreadsheet',
       GSLIDES_DOCUMENT_FILE_TYPE: 'Google presentation',
 
-      PASTE_ITEMS_REMAINING: 'Transferring $1 items',
-      PASTE_CANCELLED: 'Transfer cancelled.',
-      PASTE_TARGET_EXISTS_ERROR: 'Transfer failed, item exists: "$1"',
-      PASTE_FILESYSTEM_ERROR: 'Transfer failed. $1',
-      PASTE_UNEXPECTED_ERROR: 'Transfer failed, unexpected error: $1',
+      TRANSFER_ITEMS_REMAINING: 'Transferring $1 items',
+      TRANSFER_CANCELLED: 'Transfer cancelled.',
+      TRANSFER_TARGET_EXISTS_ERROR: 'Transfer failed, item exists: "$1"',
+      TRANSFER_FILESYSTEM_ERROR: 'Transfer failed. $1',
+      TRANSFER_UNEXPECTED_ERROR: 'Transfer failed, unexpected error: $1',
+      COPY_FILE_NAME: 'Copying $1',
+      COPY_ITEMS_REMAINING: 'Copying $1 items.',
+      COPY_CANCELLED: 'Copy operation cancelled.',
+      COPY_TARGET_EXISTS_ERROR: 'Copy operation failed, item exists: "$1"',
+      COPY_FILESYSTEM_ERROR: 'Copy operation failed. $1',
+      COPY_UNEXPECTED_ERROR: 'Copy operation failed, unexpected error: $1',
+      MOVE_FILE_NAME: 'Moving $1',
+      MOVE_ITEMS_REMAINING: 'Moving $1 items.',
+      MOVE_CANCELLED: 'Move cancelled.',
+      MOVE_TARGET_EXISTS_ERROR: 'Move failed, item exists: "$1"',
+      MOVE_FILESYSTEM_ERROR: 'Move failed. $1',
+      MOVE_UNEXPECTED_ERROR: 'Move failed, unexpected error: $1',
 
       CANCEL_LABEL: 'Cancel',
       OPEN_LABEL: 'Open',