Update //third_party/protobuf to version 3.

third_party/protobuf/ruby/tests/stress.rb

+#!/usr/bin/ruby
+
+require 'google/protobuf'
+require 'test/unit'
+
+module StressTest
+  pool = Google::Protobuf::DescriptorPool.new
+  pool.build do
+    add_message "TestMessage" do
+      optional :a,  :int32,        1
+      repeated :b,  :message,      2, "M"
+    end
+    add_message "M" do
+      optional :foo, :string, 1
+    end
+  end
+
+  TestMessage = pool.lookup("TestMessage").msgclass
+  M = pool.lookup("M").msgclass
+
+  class StressTest < Test::Unit::TestCase
+    def get_msg
+      TestMessage.new(:a => 1000,
+                      :b => [M.new(:foo => "hello"),
+                             M.new(:foo => "world")])
+    end
+    def test_stress
+      m = get_msg
+      data = TestMessage.encode(m)
+      100_000.times do
+        mnew = TestMessage.decode(data)
+        mnew = mnew.dup
+        assert_equal mnew.inspect, m.inspect
+        assert TestMessage.encode(mnew) == data
+      end
+    end
+  end
+end