Reland "Move webrtc/{base => rtc_base}" (https://codereview.webrtc.org/2877023002)

Reland the base->rtc_base without adding stub headers (will be
done in follow-up CL). This preserves git blame history of all files.

BUG=webrtc:7634
NOTRY=True
TBR=kwiberg@webrtc.org

Change-Id: Iea3bb6f3f67b8374c96337b63e8f5aa3e6181012
Reviewed-on: https://chromium-review.googlesource.com/554611
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18821}

webrtc/rtc_base/nullsocketserver_unittest.cc

@@ -0,0 +1,47 @@
+/*
+ *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/base/gunit.h"
+#include "webrtc/base/nullsocketserver.h"
+
+namespace rtc {
+
+static const uint32_t kTimeout = 5000U;
+
+class NullSocketServerTest
+    : public testing::Test,
+      public MessageHandler {
+ public:
+  NullSocketServerTest() {}
+ protected:
+  virtual void OnMessage(Message* message) {
+    ss_.WakeUp();
+  }
+  NullSocketServer ss_;
+};
+
+TEST_F(NullSocketServerTest, WaitAndSet) {
+  Thread thread;
+  EXPECT_TRUE(thread.Start());
+  thread.Post(RTC_FROM_HERE, this, 0);
+  // The process_io will be ignored.
+  const bool process_io = true;
+  EXPECT_TRUE_WAIT(ss_.Wait(SocketServer::kForever, process_io), kTimeout);
+}
+
+TEST_F(NullSocketServerTest, TestWait) {
+  int64_t start = TimeMillis();
+  ss_.Wait(200, true);
+  // The actual wait time is dependent on the resolution of the timer used by
+  // the Event class. Allow for the event to signal ~20ms early.
+  EXPECT_GE(TimeSince(start), 180);
+}
+
+}  // namespace rtc