Update //third_party/protobuf to version 3.

third_party/protobuf/csharp/generate_protos.sh

Index: third_party/protobuf/csharp/generate_protos.sh
diff --git a/third_party/protobuf/csharp/generate_protos.sh b/third_party/protobuf/csharp/generate_protos.sh
new file mode 100755
index 0000000000000000000000000000000000000000..3a556b0e3fce0a9f6b94d0130e47eec085216cef
--- /dev/null
+++ b/third_party/protobuf/csharp/generate_protos.sh
@@ -0,0 +1,72 @@
+#!/bin/bash
+# Generates C# source files from .proto files.
+# You first need to make sure protoc has been built (see instructions on
+# building protoc in root of this repository)
+
+# This script performs a few fix-ups as part of generation. These are:
+# - descriptor.proto is renamed to descriptor_proto_file.proto before
+#   generation, to avoid the naming collision between the class for the file
+#   descriptor and its Descriptor property
+# - This change also impacts UnittestCustomOptions, which expects to
+#   use a class of Descriptor when it's actually been renamed to
+#   DescriptorProtoFile.
+# - Issue 307 (codegen for double-nested types) breaks Unittest.proto and
+#   its lite equivalents.
+
+set -ex
+
+# cd to repository root
+cd $(dirname $0)/..
+
+# Protocol buffer compiler to use. If the PROTOC variable is set,
+# use that. Otherwise, probe for expected locations under both
+# Windows and Unix.
+if [ -z "$PROTOC" ]; then
+  # TODO(jonskeet): Use an array and a for loop instead?
+  if [ -x cmake/build/Debug/protoc.exe ]; then
+    PROTOC=cmake/build/Debug/protoc.exe
+  elif [ -x cmake/build/Release/protoc.exe ]; then
+    PROTOC=cmake/build/Release/protoc.exe
+  elif [ -x src/protoc ]; then
+    PROTOC=src/protoc
+  else
+    echo "Unable to find protocol buffer compiler."
+    exit 1
+  fi
+fi
+
+# descriptor.proto and well-known types
+$PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf \
+    --csharp_opt=base_namespace=Google.Protobuf \
+    src/google/protobuf/descriptor.proto \
+    src/google/protobuf/any.proto \
+    src/google/protobuf/api.proto \
+    src/google/protobuf/duration.proto \
+    src/google/protobuf/empty.proto \
+    src/google/protobuf/field_mask.proto \
+    src/google/protobuf/source_context.proto \
+    src/google/protobuf/struct.proto \
+    src/google/protobuf/timestamp.proto \
+    src/google/protobuf/type.proto \
+    src/google/protobuf/wrappers.proto
+
+# Test protos where the namespace matches the target location
+$PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf.Test \
+    --csharp_opt=base_namespace=Google.Protobuf \
+    src/google/protobuf/map_unittest_proto3.proto \
+    src/google/protobuf/unittest_proto3.proto \
+    src/google/protobuf/unittest_import_proto3.proto \
+    src/google/protobuf/unittest_import_public_proto3.proto \
+    src/google/protobuf/unittest_well_known_types.proto
+
+# Different base namespace to the protos above
+$PROTOC -Icsharp/protos --csharp_out=csharp/src/Google.Protobuf.Test \
+    --csharp_opt=base_namespace=UnitTest.Issues \
+    csharp/protos/unittest_issues.proto
+
+# AddressBook sample protos
+$PROTOC -Iexamples --csharp_out=csharp/src/AddressBook \
+    examples/addressbook.proto
+
+$PROTOC -Iconformance --csharp_out=csharp/src/Google.Protobuf.Conformance \
+    conformance/conformance.proto