Increase the Java heap size for droiddoc
Increase the Java heap size for droiddoc

Increasing the Java heap for droiddoc generation from 768 to 1280
megabytes reduces build times by about 2-3 minutes. For fast
build servers this can reduce build times by around 30%. For
slower workstation class machines the build is reduced with no
other obvious undesirable side effects.

Change-Id: I4ff04318ae78fc7b5a5a0499bacfc5527e966ff6

hagar006/platform_manifest,xorware/android_build,knone1/platform_manifest,RR-msm7x30/platform_manifest,xorware/android_build,fallouttester/platform_manifest,see4ri/lolili,ND-3500/platform_manifest,Hybrid-Power/startsync,xorware/android_build,xorware/android_build,pranav01/platform_manifest,xorware/android_build