Update constraints processing for video content capture.

content/renderer/media/media_stream_constraints_util.cc

Index: content/renderer/media/media_stream_constraints_util.cc
diff --git a/content/renderer/media/media_stream_constraints_util.cc b/content/renderer/media/media_stream_constraints_util.cc
index 6af128dda4e246ee1f4bb62d3802bd8ac91c2637..a5c3b0cb6441262e34677d40a5db15ea36a60044 100644
--- a/content/renderer/media/media_stream_constraints_util.cc
+++ b/content/renderer/media/media_stream_constraints_util.cc
@@ -111,14 +111,17 @@ VideoCaptureSettings::VideoCaptureSettings(
     media::VideoCaptureParams capture_params,
     base::Optional<bool> noise_reduction,
     const VideoTrackAdapterSettings& track_adapter_settings,
-    double min_frame_rate)
+    base::Optional<double> min_frame_rate,
+    base::Optional<double> max_frame_rate)
     : failed_constraint_name_(nullptr),
       device_id_(std::move(device_id)),
       capture_params_(capture_params),
       noise_reduction_(noise_reduction),
       track_adapter_settings_(track_adapter_settings),
-      min_frame_rate_(min_frame_rate) {
-  DCHECK_LE(min_frame_rate_, capture_params.requested_format.frame_rate);
+      min_frame_rate_(min_frame_rate),
+      max_frame_rate_(max_frame_rate) {
+  DCHECK(!min_frame_rate ||
+         *min_frame_rate_ <= capture_params.requested_format.frame_rate);
   DCHECK_LE(track_adapter_settings.max_width,
             capture_params.requested_format.frame_size.width());
   DCHECK_LE(track_adapter_settings.max_height,