Update //third_party/protobuf to version 3.

third_party/protobuf/generate_descriptor_proto.sh

+#!/bin/sh
+
+# Run this script to regenerate descriptor.pb.{h,cc} after the protocol
+# compiler changes.  Since these files are compiled into the protocol compiler
+# itself, they cannot be generated automatically by a make rule.  "make check"
+# will fail if these files do not match what the protocol compiler would
+# generate.
+#
+# HINT:  Flags passed to generate_descriptor_proto.sh will be passed directly
+#   to make when building protoc.  This is particularly useful for passing
+#   -j4 to run 4 jobs simultaneously.
+
+if test ! -e src/google/protobuf/stubs/common.h; then
+  cat >&2 << __EOF__
+Could not find source code.  Make sure you are running this script from the
+root of the distribution tree.
+__EOF__
+  exit 1
+fi
+
+if test ! -e src/Makefile; then
+  cat >&2 << __EOF__
+Could not find src/Makefile.  You must run ./configure (and perhaps
+./autogen.sh) first.
+__EOF__
+  exit 1
+fi
+
+cd src
+
+declare -a RUNTIME_PROTO_FILES=(\
+  google/protobuf/any.proto \
+  google/protobuf/api.proto \
+  google/protobuf/descriptor.proto \
+  google/protobuf/duration.proto \
+  google/protobuf/empty.proto \
+  google/protobuf/field_mask.proto \
+  google/protobuf/source_context.proto \
+  google/protobuf/struct.proto \
+  google/protobuf/timestamp.proto \
+  google/protobuf/type.proto \
+  google/protobuf/wrappers.proto)
+
+CORE_PROTO_IS_CORRECT=0
+PROCESS_ROUND=1
+echo "Updating descriptor protos..."
+while [ $CORE_PROTO_IS_CORRECT -ne 1 ]
+do
+  echo "Round $PROCESS_ROUND"
+  CORE_PROTO_IS_CORRECT=1
+  for PROTO_FILE in ${RUNTIME_PROTO_FILES[@]}; do
+    BASE_NAME=${PROTO_FILE%.*}
+    cp ${BASE_NAME}.pb.h ${BASE_NAME}.pb.h.tmp
+    cp ${BASE_NAME}.pb.cc ${BASE_NAME}.pb.cc.tmp
+  done
+  cp google/protobuf/compiler/plugin.pb.h google/protobuf/compiler/plugin.pb.h.tmp
+  cp google/protobuf/compiler/plugin.pb.cc google/protobuf/compiler/plugin.pb.cc.tmp
+
+  make $@ protoc &&
+    ./protoc --cpp_out=dllexport_decl=LIBPROTOBUF_EXPORT:. ${RUNTIME_PROTO_FILES[@]} && \
+    ./protoc --cpp_out=dllexport_decl=LIBPROTOC_EXPORT:. google/protobuf/compiler/plugin.proto
+
+  for PROTO_FILE in ${RUNTIME_PROTO_FILES[@]}; do
+    BASE_NAME=${PROTO_FILE%.*}
+    diff ${BASE_NAME}.pb.h ${BASE_NAME}.pb.h.tmp > /dev/null
+    if test $? -ne 0; then
+      CORE_PROTO_IS_CORRECT=0
+    fi
+    diff ${BASE_NAME}.pb.cc ${BASE_NAME}.pb.cc.tmp > /dev/null
+    if test $? -ne 0; then
+      CORE_PROTO_IS_CORRECT=0
+    fi
+  done
+
+  diff google/protobuf/compiler/plugin.pb.h google/protobuf/compiler/plugin.pb.h.tmp > /dev/null
+  if test $? -ne 0; then
+    CORE_PROTO_IS_CORRECT=0
+  fi
+  diff google/protobuf/compiler/plugin.pb.cc google/protobuf/compiler/plugin.pb.cc.tmp > /dev/null
+  if test $? -ne 0; then
+    CORE_PROTO_IS_CORRECT=0
+  fi
+
+  for PROTO_FILE in ${RUNTIME_PROTO_FILES[@]}; do
+    BASE_NAME=${PROTO_FILE%.*}
+    rm ${BASE_NAME}.pb.h.tmp
+    rm ${BASE_NAME}.pb.cc.tmp
+  done
+  rm google/protobuf/compiler/plugin.pb.h.tmp
+  rm google/protobuf/compiler/plugin.pb.cc.tmp
+
+  PROCESS_ROUND=$((PROCESS_ROUND + 1))
+done
+cd ..
+
+if test -x objectivec/generate_descriptors_proto.sh; then
+  echo "Generating messages for objc."
+  objectivec/generate_descriptors_proto.sh $@
+fi