Add ChannelProxy benchmark to ipc_perftests.

This CL add a ChannelProxy equivalent of the Channel benchmark
to ipc_perftests.

To use it in the benchmark, TestIOThread is extracted from
mojo/system/ to base/test

TEST=IPChannelPerfTest.ChannelProxyPingPong
R=viettrungluu@chromium.org,brettw@chromium.org,darin@chromium.org
BUG=none

Review URL: https://codereview.chromium.org/488003003

Cr-Commit-Position: refs/heads/master@{#292518}

1 files changed, 6 insertions, 2 deletions

diff --git a/ipc/ipc_test_base.cc b/ipc/ipc_test_base.cc
index f893c28..974329d 100644
--- a/ipc/ipc_test_base.cc
+++ b/ipc/ipc_test_base.cc
@@ -32,7 +32,7 @@ IPCTestBase::~IPCTestBase() {
 void IPCTestBase::SetUp() {
   MultiProcessTest::SetUp();
 
-  // Construct a fresh IO Message loop for the duration of each test.
+  // Construct a fresh Message loop for the duration of each test.
   DCHECK(!message_loop_.get());
   message_loop_.reset(new base::MessageLoopForIO());
 }
@@ -130,6 +130,10 @@ bool IPCTestBase::WaitForClientShutdown() {
   return rv;
 }
 
-scoped_refptr<base::TaskRunner> IPCTestBase::io_thread_task_runner() {
+scoped_refptr<base::TaskRunner> IPCTestBase::task_runner() {
   return message_loop_->message_loop_proxy();
 }
+
+void IPCTestBase::set_message_loop(scoped_ptr<base::MessageLoop> loop) {
+  message_loop_ = loop.Pass();
+}