Add console.log(exception) to Promise.js
Add console.log(exception) to Promise.js

Without the console.log(), nothing appears in the console when tracing.js throws exceptions.

TBR=nduca

Review URL: https://codereview.appspot.com/41270043

git-svn-id: 3a56fcae908c7e16d23cb53443ea4795ac387cf2@1083 0e6d7f2b-9903-5b78-7403-59d27f066143

bpsinc-native/src_third_party_trace-viewer,bpsinc-native/src_third_party_trace-viewer,bpsinc-native/src_third_party_trace-viewer,bpsinc-native/src_third_party_trace-viewer