Adding coverage report.

.travis.yml

@@ -4,9 +4,11 @@ before_install:
   - sudo add-apt-repository ppa:h-rayflood/llvm -y
   - sudo apt-get update -qq
   - sudo apt-get install -qq libgtest-dev libgflags-dev python-virtualenv clang-3.5
+  - sudo pip install cpp-coveralls
 env:
   global:
     - RUBY_VERSION=2.1
+    - COVERALLS_PARALLEL=true
   matrix:
     - CONFIG=dbg TEST=c
     - CONFIG=dbg TEST=c++
@@ -15,9 +17,15 @@ env:
     - CONFIG=opt TEST=node
     - CONFIG=opt TEST=ruby
     - CONFIG=opt TEST=python
+    - CONFIG=gcov TEST=c
+    - CONFIG=gcov TEST=c++
 script:
   - rvm use $RUBY_VERSION
   - gem install bundler
   - ./tools/run_tests/run_tests.py -l $TEST -t -j 16 -c $CONFIG -s 4.0
+after_success:
+  - if [ "$CONFIG" = "gcov" ] ; then coveralls --exclude third_party --exclude gens -b. --gcov-options '\-p' ; fi
 notifications:
-  email: false
\ No newline at end of file
+  email: false
+  webhooks:
+    - https://coveralls.io/webhook?repo_token=54IxAHPjJNdQJzJAhPU0MFpCtg7KvcydQ