Mojo: Add the ability to hook up a channel to the embedder API.

mojo/system/test_utils.h

Index: mojo/system/test_utils.h
diff --git a/mojo/system/test_utils.h b/mojo/system/test_utils.h
index d40490f5f2a48d597dc16f5d6215cc94e30f8982..73949b9055be2825d35151e67b1c91175d8ea692 100644
--- a/mojo/system/test_utils.h
+++ b/mojo/system/test_utils.h
@@ -7,11 +7,14 @@
 
 #include <stdint.h>
 
-#include "base/basictypes.h"
 #include "base/callback_forward.h"
+#include "base/compiler_specific.h"
+#include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/task_runner.h"
+#include "base/threading/thread.h"
 #include "base/time/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
 
 namespace tracked_objects {
 class Location;
@@ -47,6 +50,31 @@ void PostTaskAndWait(scoped_refptr<base::TaskRunner> task_runner,
                      const tracked_objects::Location& from_here,
                      const base::Closure& task);
 
+// TestWithIOThreadBase --------------------------------------------------------
+
+class TestWithIOThreadBase : public testing::Test {
+ public:
+  TestWithIOThreadBase();
+  virtual ~TestWithIOThreadBase();
+
+  virtual void SetUp() OVERRIDE;
+  virtual void TearDown() OVERRIDE;
+
+ protected:
+  base::MessageLoop* io_thread_message_loop() {
+    return io_thread_.message_loop();
+  }
+
+  scoped_refptr<base::TaskRunner> io_thread_task_runner() {
+    return io_thread_message_loop()->message_loop_proxy();
+  }
+
+ private:
+  base::Thread io_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestWithIOThreadBase);
+};
+
 }  // namespace test
 }  // namespace system
 }  // namespace mojo