Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/modules/audio_processing/aec-tmp/echo_cancellation_unittest.cc

@@ -0,0 +1,50 @@
+/*
+ *  Copyright (c) 2013 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.
+ */
+
+// TODO(bjornv): Make this a comprehensive test.
+
+#include "webrtc/modules/audio_processing/aec/include/echo_cancellation.h"
+
+#include <stdlib.h>
+#include <time.h>
+
+extern "C" {
+#include "webrtc/modules/audio_processing/aec/aec_core.h"
+}
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace webrtc {
+
+TEST(EchoCancellationTest, CreateAndFreeHandlesErrors) {
+  EXPECT_EQ(-1, WebRtcAec_Create(NULL));
+  void* handle = NULL;
+  ASSERT_EQ(0, WebRtcAec_Create(&handle));
+  EXPECT_TRUE(handle != NULL);
+  EXPECT_EQ(-1, WebRtcAec_Free(NULL));
+  EXPECT_EQ(0, WebRtcAec_Free(handle));
+}
+
+TEST(EchoCancellationTest, ApplyAecCoreHandle) {
+  void* handle = NULL;
+  ASSERT_EQ(0, WebRtcAec_Create(&handle));
+  EXPECT_TRUE(handle != NULL);
+  EXPECT_TRUE(WebRtcAec_aec_core(NULL) == NULL);
+  AecCore* aec_core = WebRtcAec_aec_core(handle);
+  EXPECT_TRUE(aec_core != NULL);
+  // A simple test to verify that we can set and get a value from the lower
+  // level |aec_core| handle.
+  int delay = 111;
+  WebRtcAec_SetSystemDelay(aec_core, delay);
+  EXPECT_EQ(delay, WebRtcAec_system_delay(aec_core));
+  EXPECT_EQ(0, WebRtcAec_Free(handle));
+}
+
+}  // namespace webrtc