DevTools: introduce uiSourceCode.mimeType() method

third_party/WebKit/Source/devtools/front_end/persistence/FileSystemWorkspaceBinding.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 219 matching lines @@
   }
 
   /**
    * @return {string}
    */
   fileSystemPath() {
     return this._fileSystemPath;
   }
 
   /**
+   * @override
+   * @param {!Workspace.UISourceCode} uiSourceCode
+   * @return {string}
+   */
+  mimeType(uiSourceCode) {
+    return Common.ResourceType.mimeFromURL(uiSourceCode.url()) || 'text/plain';
+  }
+
+  /**
    * @return {!Array<string>}
    */
   initialGitFolders() {
     return this._fileSystem.initialGitFolders().map(folder => this._fileSystemPath + '/' + folder);
   }
 
   /**
    * @param {!Workspace.UISourceCode} uiSourceCode
    * @return {string}
    */
@@ skipping 333 matching lines @@
     uiSourceCode[Persistence.FileSystemWorkspaceBinding._metadata] = null;
     uiSourceCode.checkContentUpdated();
   }
 
   dispose() {
     this.removeProject();
   }
 };
 
 Persistence.FileSystemWorkspaceBinding._metadata = Symbol('FileSystemWorkspaceBinding.Metadata');