Add UUID::InitializeFromString().

util/misc/uuid.h

Index: util/misc/uuid.h
diff --git a/util/misc/uuid.h b/util/misc/uuid.h
index c2529dfca74d9344790ee28c454d5aa73c68b6ca..27e2d9a5de1aca5eb35cbe27879a4b053a8dc1f5 100644
--- a/util/misc/uuid.h
+++ b/util/misc/uuid.h
@@ -19,6 +19,8 @@
 
 #include <string>
 
+#include "base/strings/string_piece.h"
+
 namespace crashpad {
 
 //! \brief A universally unique identifier (%UUID).
@@ -49,6 +51,16 @@ struct UUID {
   //!     %UUID.
   void InitializeFromBytes(const uint8_t* bytes);
 
+  //! \brief Initializes the %UUID from a RFC 4122 §3 formatted string.
+  //!
+  //! \param[in] string A string of the form
+  //!     `"00112233-4455-6677-8899-aabbccddeeff"`.
+  //!
+  //! \return `true` if the string was formatted correctly and the object has
+  //!     been initialized with the data. `false` if the string could not be
+  //!     parsed, with the object state untouched.
+  bool InitializeFromString(const base::StringPiece& string);
+
   //! \brief Formats the %UUID per RFC 4122 §3.
   //!
   //! \return A string of the form `"00112233-4455-6677-8899-aabbccddeeff"`.