Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/system_wrappers/source/thread_posix_unittest.cc

@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 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/system_wrappers/source/thread_posix.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(ThreadTestPosix, PrioritySettings) {
+  // API assumes that max_prio - min_prio > 2. Test the extreme case.
+  const int kMinPrio = -1;
+  const int kMaxPrio = 2;
+
+  int last_priority = kMinPrio;
+  for (int priority = webrtc::kLowPriority;
+       priority <= webrtc::kRealtimePriority; ++priority) {
+    int system_priority = webrtc::ConvertToSystemPriority(
+        static_cast<webrtc::ThreadPriority>(priority), kMinPrio, kMaxPrio);
+    EXPECT_GT(system_priority, kMinPrio);
+    EXPECT_LT(system_priority, kMaxPrio);
+    EXPECT_GE(system_priority, last_priority);
+    last_priority = system_priority;
+  }
+}