Non-constraint interfaces for all constrainable interfaces

webrtc/api/mediaconstraintsinterface.h

Index: webrtc/api/mediaconstraintsinterface.h
diff --git a/webrtc/api/mediaconstraintsinterface.h b/webrtc/api/mediaconstraintsinterface.h
index 0c251f879387c7189120e6cb3601e5e42232dc12..b615c2eb9949c28a424518f1ea82ded9490f6d17 100644
--- a/webrtc/api/mediaconstraintsinterface.h
+++ b/webrtc/api/mediaconstraintsinterface.h
@@ -19,6 +19,8 @@
 #include <string>
 #include <vector>
 
+#include "webrtc/base/optional.h"
+
 namespace webrtc {
 
 // MediaConstraintsInterface
@@ -118,6 +120,18 @@ bool FindConstraint(const MediaConstraintsInterface* constraints,
                     const std::string& key, bool* value,
                     size_t* mandatory_constraints);
 
+bool FindConstraint(const MediaConstraintsInterface* constraints,
+                    const std::string& key,
+                    int* value,
+                    size_t* mandatory_constraints);
+
+rtc::Optional<bool> ConstraintToOptionalBool(
+    const MediaConstraintsInterface* constraints,
+    const std::string& key);
+rtc::Optional<int> ConstraintToOptionalInt(
+    const MediaConstraintsInterface* constraints,
+    const std::string& key);
+
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_MEDIACONSTRAINTSINTERFACE_H_