DevFS initial implementation

runtime/include/dart_tools_api.h

Index: runtime/include/dart_tools_api.h
diff --git a/runtime/include/dart_tools_api.h b/runtime/include/dart_tools_api.h
index 961c444d702bf9f75bc00c9507106a61f0efc70c..62d9dbc1664715f42618e89e063cc69051fc1dd3 100644
--- a/runtime/include/dart_tools_api.h
+++ b/runtime/include/dart_tools_api.h
@@ -897,6 +897,44 @@ DART_EXPORT Dart_Handle Dart_ServiceSendDataEvent(const char* stream_id,
                                                   intptr_t bytes_length);
 
 /*
+ * =====
+ * DevFS
+ * =====
+ */
+
+/**
+ * Determines if a uri is a DevFS uri.
+ *
+ * \param uri The uri to test. This parameter is a string.
+ *
+ * \return true if uri is a DevFS uri and false otherwise.
+ */
+DART_EXPORT bool Dart_IsDevFSUri(Dart_Handle uri);

[turnidge, 2016/06/10 18:45:34]

Consider dropping the embedding api changes until they are actually used
somewhere.

+
+
+/**
+ * Attempts to read the DevFS file at uri.
+ *
+ * \param uri The uri to read. This parameter is a string.
+ *
+ * \return A typed data array of Dart_TypedData_kUint8 containing the contents
+ * of the file. Otherwise, returns an error handle.
+ */
+DART_EXPORT Dart_Handle Dart_DevFSReadFile(Dart_Handle uri);
+
+
+/**
+ * Attempts to read the DevFS file at uri.
+ *
+ * \param uri The uri to read. This parameter is a string.
+ *
+ * \return A string containing the contents of the file. Otherwise,
+ * returns an error handle.
+ */
+DART_EXPORT Dart_Handle Dart_DevFSReadFileAsUTF8String(Dart_Handle uri);
+
+
+/*
  * ========
  * Timeline
  * ========