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..b65e84cf4aba6f74d9ec466c6edfb324ab3a7d4c 100644
--- a/webrtc/api/videocapturertracksource_unittest.cc
+++ b/webrtc/api/videocapturertracksource_unittest.cc
@@ -444,6 +444,26 @@ TEST_F(VideoCapturerTrackSourceTest, ScreencastResolutionWithConstraint) {
   EXPECT_EQ(30, format->framerate());
 }
 
+TEST_F(VideoCapturerTrackSourceTest, DenoisingDefault) {
+  CreateVideoCapturerSource();
+  EXPECT_FALSE(source_->needs_denoising());
+}
+
+TEST_F(VideoCapturerTrackSourceTest, DenoisingConstraintOn) {

[pbos-webrtc, 2016/09/13 14:02:09]

I would like a test for constraints overriding the capturer/track option as
well, I believe the constraints should go on top of capturer settings, and it's
OK that they override track defaults.

[nisse-webrtc, 2016/09/13 14:24:05]

Done.

+  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(false);
+  CreateVideoCapturerSource();
+  ASSERT_TRUE(source_->needs_denoising());
+  EXPECT_FALSE(*source_->needs_denoising());
+}
+
 TEST_F(VideoCapturerTrackSourceTest, MandatorySubOneFpsConstraints) {
   FakeConstraints constraints;
   constraints.AddMandatory(MediaConstraintsInterface::kMaxFrameRate, 0.5);