Add "exact" constraint evaluation to video picker.

content/renderer/media/media_stream_constraints_util.cc

 // 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.
 
 #include "content/renderer/media/media_stream_constraints_util.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
 #include "third_party/WebKit/public/platform/WebString.h"
@@ skipping 23 matching lines @@
 
 template <typename P, typename T>
 bool ScanConstraintsForMaxValue(const blink::WebMediaConstraints& constraints,
                                 P picker,
                                 T* value) {
   const auto& the_field = constraints.basic().*picker;
   if (the_field.hasMax()) {
     *value = the_field.max();
     return true;
   }
+  if (the_field.hasExact()) {
+    *value = the_field.exact();
+    return true;
+  }
   for (const auto& advanced_constraint : constraints.advanced()) {
     const auto& the_field = advanced_constraint.*picker;
     if (the_field.hasMax()) {
       *value = the_field.max();
       return true;
     }
+    if (the_field.hasExact()) {
+      *value = the_field.exact();
+      return true;
+    }
   }
   return false;
 }
 
 template <typename P, typename T>
 bool ScanConstraintsForMinValue(const blink::WebMediaConstraints& constraints,
                                 P picker,
                                 T* value) {
   const auto& the_field = constraints.basic().*picker;
   if (the_field.hasMin()) {
     *value = the_field.min();
     return true;
   }
+  if (the_field.hasExact()) {
+    *value = the_field.exact();
+    return true;
+  }
   for (const auto& advanced_constraint : constraints.advanced()) {
     const auto& the_field = advanced_constraint.*picker;
     if (the_field.hasMin()) {
       *value = the_field.min();
       return true;
     }
+    if (the_field.hasExact()) {
+      *value = the_field.exact();
+      return true;
+    }
   }
   return false;
 }
 
 }  // namespace
 
 bool GetConstraintValueAsBoolean(
     const blink::WebMediaConstraints& constraints,
     const blink::BooleanConstraint blink::WebMediaTrackConstraintSet::*picker,
     bool* value) {
@@ skipping 58 matching lines @@
     const blink::WebMediaConstraints& constraints,
     const blink::BooleanConstraint blink::WebMediaTrackConstraintSet::*picker) {
   bool value;
   if (GetConstraintValueAsBoolean(constraints, picker, &value)) {
     return rtc::Optional<bool>(value);
   }
   return rtc::Optional<bool>();
 }
 
 }  // namespace content