Add print samples to the ApiDemos app.

1. Added a sample for printing a bitmap.

2. Added a sample for printing an on-screen WebView.

3. Added s sample for printing an off-screen WebView.

4. Fixed a bug in the custom layout print sample.

Change-Id: I35b2bbf8c7fd9bc39be795b1f793d9ea7bdfc8a0
12 files changed