In PeerConnectionTestWrapper, put audio input on a separate thread.

talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc

Index: talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc
diff --git a/talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc b/talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc
index 56f1d070eddfdebc1b1d29bbfe976c219d45f402..fcfdf7e754607ea022214212dec33ea6d00f2ef0 100644
--- a/talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc
+++ b/talk/app/webrtc/test/fakeaudiocapturemodule_unittest.cc
@@ -29,6 +29,7 @@
 
 #include <algorithm>
 
+#include "webrtc/base/criticalsection.h"
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/scoped_ref_ptr.h"
 #include "webrtc/base/thread.h"
@@ -48,8 +49,7 @@ class FakeAdmTest : public testing::Test,
   }
 
   virtual void SetUp() {
-    fake_audio_capture_module_ = FakeAudioCaptureModule::Create(
-        rtc::Thread::Current());
+    fake_audio_capture_module_ = FakeAudioCaptureModule::Create();
     EXPECT_TRUE(fake_audio_capture_module_.get() != NULL);
   }
 
@@ -65,6 +65,7 @@ class FakeAdmTest : public testing::Test,
                                   const uint32_t currentMicLevel,
                                   const bool keyPressed,
                                   uint32_t& newMicLevel) override {
+    rtc::CritScope cs(&crit_);
     rec_buffer_bytes_ = nSamples * nBytesPerSample;
     if ((rec_buffer_bytes_ == 0) ||
         (rec_buffer_bytes_ > FakeAudioCaptureModule::kNumberSamples *
@@ -87,6 +88,7 @@ class FakeAdmTest : public testing::Test,
                            uint32_t& nSamplesOut,
                            int64_t* elapsed_time_ms,
                            int64_t* ntp_time_ms) override {
+    rtc::CritScope cs(&crit_);
     ++pull_iterations_;
     const uint32_t audio_buffer_size = nSamples * nBytesPerSample;
     const uint32_t bytes_out = RecordedDataReceived() ?
@@ -98,8 +100,14 @@ class FakeAdmTest : public testing::Test,
     return 0;
   }
 
-  int push_iterations() const { return push_iterations_; }
-  int pull_iterations() const { return pull_iterations_; }
+  int push_iterations() const {
+    rtc::CritScope cs(&crit_);
+    return push_iterations_;
+  }
+  int pull_iterations() const {
+    rtc::CritScope cs(&crit_);
+    return pull_iterations_;
+  }
 
   rtc::scoped_refptr<FakeAudioCaptureModule> fake_audio_capture_module_;
 
@@ -118,6 +126,8 @@ class FakeAdmTest : public testing::Test,
     return min_buffer_size;
   }
 
+  mutable rtc::CriticalSection crit_;
+
   int push_iterations_;
   int pull_iterations_;