Add method cricket::VideoCapturer::NeedsDenoising, use in VideoCapturerTrackSource.

webrtc/api/videocapturertracksource_unittest.cc

Index: webrtc/api/videocapturertracksource_unittest.cc
diff --git a/webrtc/api/videocapturertracksource_unittest.cc b/webrtc/api/videocapturertracksource_unittest.cc
index 607188c0448b266ff15e623482637d3ffa0806e1..48133b1736c538928ac9f1f8d79e6f30f7b120fd 100644
--- a/webrtc/api/videocapturertracksource_unittest.cc
+++ b/webrtc/api/videocapturertracksource_unittest.cc
@@ -444,6 +444,35 @@ TEST_F(VideoCapturerTrackSourceTest, ScreencastResolutionWithConstraint) {
   EXPECT_EQ(30, format->framerate());
 }
 
+TEST_F(VideoCapturerTrackSourceTest, DenoisingDefault) {
+  CreateVideoCapturerSource();
+  EXPECT_FALSE(source_->needs_denoising());
+}
+
+TEST_F(VideoCapturerTrackSourceTest, DenoisingConstraintOn) {
+  FakeConstraints constraints;
+  constraints.AddOptional(MediaConstraintsInterface::kNoiseReduction, true);
+  CreateVideoCapturerSource(&constraints);
+  ASSERT_TRUE(source_->needs_denoising());
+  EXPECT_TRUE(*source_->needs_denoising());
+}
+
+TEST_F(VideoCapturerTrackSourceTest, DenoisingCapturerOff) {
+  capturer_->SetNeedsDenoising(rtc::Optional<bool>(false));
+  CreateVideoCapturerSource();
+  ASSERT_TRUE(source_->needs_denoising());
+  EXPECT_FALSE(*source_->needs_denoising());
+}
+
+TEST_F(VideoCapturerTrackSourceTest, DenoisingConstraintOverridesCapturer) {
+  capturer_->SetNeedsDenoising(rtc::Optional<bool>(false));
+  FakeConstraints constraints;
+  constraints.AddOptional(MediaConstraintsInterface::kNoiseReduction, true);
+  CreateVideoCapturerSource(&constraints);
+  ASSERT_TRUE(source_->needs_denoising());
+  EXPECT_TRUE(*source_->needs_denoising());
+}
+
 TEST_F(VideoCapturerTrackSourceTest, MandatorySubOneFpsConstraints) {
   FakeConstraints constraints;
   constraints.AddMandatory(MediaConstraintsInterface::kMaxFrameRate, 0.5);