mozilla/pdf.js — pull request #3684 by Rob--W (2013-09-13 13:33:49+00:00)
Title: Implement hand tool

Implement hand tool, requested in #2957.

The logic for the hand tool is implemented in a separate project, maintained at https://github.com/Rob--W/grab-to-pan.js.

Integration notes:
- Added toggle as an entry under the Secondary toolbar
- Added shortcut "h" to toggle hand tool. This shortcut is also used in Adobe's Acrobat Reader.

### Remaining tasks:

- [ ] Localizations for the button and labels:
```
hand_tool_enable=
hand_tool_enable_label=
hand_tool_disable=
hand_tool_disable_label=
```

- [ ] Persistence of hand tool preference, preferably in a global setting (I'd like to have the hand mode by default). Some work on this feature (default preferences) has already been done in PR #3255.