Let Contraints Controll Mute/Unmute Audio Local Playback For Desktop Sharing

third_party/WebKit/Source/platform/exported/WebMediaConstraints.cpp

Index: third_party/WebKit/Source/platform/exported/WebMediaConstraints.cpp
diff --git a/third_party/WebKit/Source/platform/exported/WebMediaConstraints.cpp b/third_party/WebKit/Source/platform/exported/WebMediaConstraints.cpp
index 2ef844e0002bb8293133364d89bd6f71d51cc582..4af1df1b538e7b88408c3714c30be52597f9c8b8 100644
--- a/third_party/WebKit/Source/platform/exported/WebMediaConstraints.cpp
+++ b/third_party/WebKit/Source/platform/exported/WebMediaConstraints.cpp
@@ -384,6 +384,7 @@ WebMediaTrackConstraintSet::WebMediaTrackConstraintSet()
     , deviceId("deviceId")
     , groupId("groupId")
     , mediaStreamSource("mediaStreamSource")
+    , muteSourceAudio("muteSourceAudio")
     , renderToAssociatedSink("chromeRenderToAssociatedSink")
     , hotwordEnabled("hotwordEnabled")
     , googEchoCancellation("googEchoCancellation")
@@ -430,7 +431,7 @@ std::vector<const BaseConstraint*> WebMediaTrackConstraintSet::allConstraints()
     const BaseConstraint* temp[] = {
         &width, &height, &aspectRatio, &frameRate, &facingMode, &volume,
         &sampleRate, &sampleSize, &echoCancellation, &latency, &channelCount,
-        &deviceId, &groupId, &mediaStreamSource, &renderToAssociatedSink,
+        &deviceId, &groupId, &mediaStreamSource, &muteSourceAudio, &renderToAssociatedSink,
         &hotwordEnabled, &googEchoCancellation,
         &googExperimentalEchoCancellation, &googAutoGainControl,
         &googExperimentalAutoGainControl, &googNoiseSuppression,