Add PDF generation to SampleApp.

Add a way to save to PDF in SampleApp on Android and elsewhere.

In Android, add the PDF file to downloads, so it can be opened.

[DerekS, 2011-06-21 14:33:27]

http://codereview.appspot.com/4638052/diff/1/samplecode/SampleApp.cpp
File samplecode/SampleApp.cpp (right):

http://codereview.appspot.com/4638052/diff/1/samplecode/SampleApp.cpp#newcode...
samplecode/SampleApp.cpp:1060: case 'e':
Why 'e'?  Something like 'p' would seem to make more sense.

[Scroggo, 2011-06-21 14:36:15]

http://codereview.appspot.com/4638052/diff/1/samplecode/SampleApp.cpp
File samplecode/SampleApp.cpp (right):

http://codereview.appspot.com/4638052/diff/1/samplecode/SampleApp.cpp#newcode...
samplecode/SampleApp.cpp:1060: case 'e':
On 2011/06/21 14:33:27, djsollen wrote:
> Why 'e'?  Something like 'p' would seem to make more sense.

Agreed.  'p' is used for "Pipe", though.  Only so many letters in the alphabet,
and this was one of the few remaining.  Ideally, we would have a menu, instead
of hardcoding letter identifiers, and we do have an action bar menu option on
Android

[DerekS, 2011-06-21 14:38:16]

lgtm