Add the target to build peerconnection native in libjingle.gyp.
Add the target to build peerconnection native in libjingle.gyp.

TEST=Unittests

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=107031

Review URL: http://codereview.chromium.org/8374014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@107201 0039d316-1c4b-4281-b951-d872f2087c98

yitian134/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,adobe/chromium,ropik/chromium,adobe/chromium,adobe/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium