Add video frame refresh to MediaStream and VideoCapture stacks.

content/renderer/media/media_stream_constraints_util.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_CONSTRAINTS_UTIL_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_CONSTRAINTS_UTIL_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
@@ skipping 29 matching lines @@
     int* value);
 
 // Method to get double precision value of constraint with |name| from
 // constraints. Returns true if the constraint is specified in either mandatory
 // or Optional constraints.
 bool CONTENT_EXPORT GetConstraintValueAsDouble(
     const blink::WebMediaConstraints& constraints,
     const blink::DoubleConstraint blink::WebMediaTrackConstraintSet::*picker,
     double* value);
 
+bool CONTENT_EXPORT GetConstraintMinAsDouble(
+    const blink::WebMediaConstraints& constraints,
+    const blink::DoubleConstraint blink::WebMediaTrackConstraintSet::*picker,
+    double* value);
+
 bool CONTENT_EXPORT GetConstraintMaxAsDouble(
     const blink::WebMediaConstraints& constraints,
     const blink::DoubleConstraint blink::WebMediaTrackConstraintSet::*picker,
     double* value);
 
 // Method to get std::string value of constraint with |name| from constraints.
 // Returns true if the constraint is specified in either mandatory or Optional
 // constraints.
 bool CONTENT_EXPORT GetConstraintValueAsString(
     const blink::WebMediaConstraints& constraints,
     const blink::StringConstraint blink::WebMediaTrackConstraintSet::*picker,
     std::string* value);
 
 rtc::Optional<bool> ConstraintToOptional(
     const blink::WebMediaConstraints& constraints,
     const blink::BooleanConstraint blink::WebMediaTrackConstraintSet::*picker);
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_CONSTRAINTS_UTIL_H_