Update //third_party/protobuf to version 3.

third_party/protobuf/.travis.yml

Index: third_party/protobuf/.travis.yml
diff --git a/third_party/protobuf/.travis.yml b/third_party/protobuf/.travis.yml
new file mode 100644
index 0000000000000000000000000000000000000000..e368826f0b5ec5b8b431d347c2980cc3460875f5
--- /dev/null
+++ b/third_party/protobuf/.travis.yml
@@ -0,0 +1,71 @@
+sudo: required
+# Note: travis currently does not support listing more than one language so
+# this cheats and claims to only be cpp.  If they add multiple language
+# support, this should probably get updated to install steps and/or
+# rvm/gemfile/jdk/etc. entries rather than manually doing the work.
+language: cpp
+os:
+  - linux
+  - osx
+# The Objective C build needs Xcode 6.4 or later.
+osx_image: xcode7.1
+script:
+  - ./travis.sh $CONFIG
+env:
+  - CONFIG=cpp
+  - CONFIG=cpp_distcheck
+  - CONFIG=csharp
+  - CONFIG=golang
+  - CONFIG=java_jdk6
+  - CONFIG=java_jdk7
+  - CONFIG=java_oracle7
+  - CONFIG=javanano_jdk6
+  - CONFIG=javanano_jdk7
+  - CONFIG=javanano_oracle7
+  - CONFIG=javascript
+  - CONFIG=python
+  - CONFIG=python_cpp
+  - CONFIG=ruby19
+  - CONFIG=ruby20
+  - CONFIG=ruby21
+  - CONFIG=ruby22
+  - CONFIG=jruby
+matrix:
+  exclude:
+    # It's nontrivial to programmatically install a new JDK from the command
+    # line on OS X, so we rely on testing on Linux for Java code.
+    - os: osx
+      env: CONFIG=java_jdk6
+    - os: osx
+      env: CONFIG=java_jdk7
+    - os: osx
+      env: CONFIG=java_oracle7
+    - os: osx
+      env: CONFIG=javanano_jdk6
+    - os: osx
+      env: CONFIG=javanano_jdk7
+    - os: osx
+      env: CONFIG=javanano_oracle7
+    # Requires installing mono, currently travis.sh is doing that with apt-get
+    # which doesn't work on OS X.
+    - os: osx
+      env: CONFIG=csharp
+    # Requires installing golang, currently travis.sh is doing that with apt-get
+    # which doesn't work on OS X.
+    - os: osx
+      env: CONFIG=golang
+  # Add into the matrix OS X tests of Objective C (needs Xcode, so it won't
+  # work on other platforms). These are split so it doesn't take as long to run.
+  include:
+    - os: osx
+      env: CONFIG=objectivec_ios
+    - os: osx
+      env: CONFIG=objectivec_osx
+  allow_failures:
+    # These currently do not work on OS X but are being worked on by @haberman.
+    - os: osx
+      env: CONFIG=ruby22
+    - os: osx
+      env: CONFIG=jruby
+notifications:
+  email: false