Refactor VideoDestinationHandler to implement MediaStreamVideoSource.

content/renderer/media/rtc_media_constraints.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include "content/renderer/media/rtc_media_constraints.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "content/common/media/media_stream_options.h"
+#include "content/renderer/media/media_stream_video_source.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
 #include "third_party/WebKit/public/platform/WebCString.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 
 namespace content {
 namespace {
 
 void GetNativeMediaConstraints(
     const blink::WebVector<blink::WebMediaConstraint>& constraints,
     webrtc::MediaConstraintsInterface::Constraints* native_constraints) {
   DCHECK(native_constraints);
   for (size_t i = 0; i < constraints.size(); ++i) {
     webrtc::MediaConstraintsInterface::Constraint new_constraint;
     new_constraint.key = constraints[i].m_name.utf8();
     new_constraint.value = constraints[i].m_value.utf8();
 
     // Ignore Chrome specific Tab capture constraints.
     if (new_constraint.key == kMediaStreamSource ||
         new_constraint.key == kMediaStreamSourceId)
       continue;
 
     // Ignore sourceId constraint since that has nothing to do with webrtc.
     if (new_constraint.key == kMediaStreamSourceInfoId)
       continue;
 
+    // Ignore constraints that are handled by Chrome in MediaStreamVideoSource.
+    if (MediaStreamVideoSource::IsConstraintSupported(new_constraint.key))
+      continue;
+
     DVLOG(3) << "MediaStreamConstraints:" << new_constraint.key
              << " : " <<  new_constraint.value;
     native_constraints->push_back(new_constraint);
   }
 }
 
 }  // namespace
 
 RTCMediaConstraints::RTCMediaConstraints() {}
 
@@ skipping 45 matching lines @@
         iter->value = value;
       return override_if_exists;
     }
   }
   // The key wasn't found, add it.
   constraints->push_back(Constraint(key, value));
   return true;
 }
 
 }  // namespace content