[TIMOB-20483] Android: fix file upload progress by adding setChunkedStreamingMode

[m1ga]

JIRA: https://jira.appcelerator.org/browse/TIMOB-20483

Problem
When upload bigger files the progress is faster then the real upload (see JIRA for full description)

Solution:
Android dev guide (https://developer.android.com/reference/java/net/HttpURLConnection.html) recommends the following:

For best performance, you should call either setFixedLengthStreamingMode(int) when the body length is known in advance, or setChunkedStreamingMode(int) when it is not. Otherwise HttpURLConnection will be forced to buffer the complete request body in memory before it is transmitted, wasting (and possibly exhausting) heap and increasing latency. 

adding setChunkedStreamingMode(1024) fixed the problem. 1024 (1kb) is recommended in different stackoverflow postings as a good default value.

[hieupham007]

Code tested and works fine! However, what about this change that is NOT in the PR:
setRequestHeader("Transfer-Encoding", "chunked")
I saw some problems with it not being there: http://stackoverflow.com/questions/15913844/setting-setchunkedstreamingmode-in-httpurlconnection-fails-to-deliver-data-to-se

[hansemannn]

@m1ga thoughts?

[m1ga]

sure, I can add that. It seems that you don't need it everytime but it shouldn't break anything so it's better to have it in!

[ashcoding]

Functionally tested and reviewed. APPROVED

[build]

Can one of the admins verify this patch?

[ashcoding]

@build Verified.