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/ptr_util_unittest.cc

@@ -0,0 +1,69 @@
+/*
+ *  Copyright 2017 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/ptr_util.h"
+
+#include <stddef.h>
+#include <string>
+
+#include "webrtc/base/gunit.h"
+
+namespace rtc {
+
+namespace {
+
+class DeleteCounter {
+ public:
+  DeleteCounter() { ++count_; }
+  ~DeleteCounter() { --count_; }
+
+  static size_t count() { return count_; }
+
+ private:
+  static size_t count_;
+};
+
+size_t DeleteCounter::count_ = 0;
+
+}  // namespace
+
+TEST(PtrUtilTest, WrapUnique) {
+  EXPECT_EQ(0u, DeleteCounter::count());
+  DeleteCounter* counter = new DeleteCounter;
+  EXPECT_EQ(1u, DeleteCounter::count());
+  std::unique_ptr<DeleteCounter> owned_counter = WrapUnique(counter);
+  EXPECT_EQ(1u, DeleteCounter::count());
+  owned_counter.reset();
+  EXPECT_EQ(0u, DeleteCounter::count());
+}
+
+TEST(PtrUtilTest, MakeUniqueScalar) {
+  auto s = MakeUnique<std::string>();
+  EXPECT_EQ("", *s);
+
+  auto s2 = MakeUnique<std::string>("test");
+  EXPECT_EQ("test", *s2);
+}
+
+TEST(PtrUtilTest, MakeUniqueScalarWithMoveOnlyType) {
+  using MoveOnly = std::unique_ptr<std::string>;
+  auto p = MakeUnique<MoveOnly>(MakeUnique<std::string>("test"));
+  EXPECT_EQ("test", **p);
+}
+
+TEST(PtrUtilTest, MakeUniqueArray) {
+  EXPECT_EQ(0u, DeleteCounter::count());
+  auto a = MakeUnique<DeleteCounter[]>(5);
+  EXPECT_EQ(5u, DeleteCounter::count());
+  a.reset();
+  EXPECT_EQ(0u, DeleteCounter::count());
+}
+
+}  // namespace rtc