root/chrome/android/java/src/org/chromium/chrome/browser/contextmenu/

[..]
  1. ChromeContextMenuItemDelegate.java
  2. ChromeContextMenuPopulator.java
  3. ContextMenuHelper.java
  4. ContextMenuParams.java
  5. ContextMenuPopulator.java
  6. ContextMenuPopulatorWrapper.java
  7. EmptyChromeContextMenuItemDelegate.java
[..]