[filemanager] Context menu command to pin/unpin file on Drive.

chrome/browser/resources/file_manager/js/file_manager_commands.js

Index: chrome/browser/resources/file_manager/js/file_manager_commands.js
===================================================================
--- chrome/browser/resources/file_manager/js/file_manager_commands.js	(revision 169329)
+++ chrome/browser/resources/file_manager/js/file_manager_commands.js	(working copy)
@@ -40,6 +40,23 @@
 };
 
 /**
+ * Returns a single selected/passed entry or null.
+ * @param {Event} event Command event.
+ * @param {FileManager} fileManager FileManager to use.
+ * @return {FileEntry} The entry or null.
+ */
+CommandUtil.getSingleEntry = function(event, fileManager) {
+  if (event.target.entry) {
+    return event.target.entry;
+  }
+  var selection = fileManager.getSelection();
+  if (selection.totalCount == 1) {
+    return selection.entries[0];
+  }
+  return null;
+};
+
+/**
  * Registers handler on specific command on specific node.
  * @param {Node} node Node to register command handler on.
  * @param {string} commandId Command id to respond to.
@@ -308,6 +325,51 @@
 };
 
 /**
+ * Flips 'available offline' flag on the file.
+ */
+Commands.togglePinnedCommand = {
+  execute: function(event, fileManager) {
+    var pin = !event.command.checked;
+    var entry = CommandUtil.getSingleEntry(event, fileManager);
+
+    function showError(filesystem) {
+      fileManager.alert.showHtml(str('GDATA_OUT_OF_SPACE_HEADER'),
+          strf('GDATA_OUT_OF_SPACE_MESSAGE',
+               unescape(entry.name),
+               util.bytesToSi(filesystem.size)));
+    }
+
+    function callback(props) {
+      var fileProps = props[0];
+      if (fileProps.errorCode && pin) {
+        fileManager.metadataCache_.get(entry, 'filesystem', showError);
+      }
+      // We don't have update events yet, so clear the cached data.
+      fileManager.metadataCache_.clear(entry, 'gdata');
+      fileManager.metadataCache_.get(entry, 'gdata', function(gdata) {
+        fileManager.updateMetadataInUI_('gdata', [entry.toURL()], [gdata]);
+      });
+    }
+
+    chrome.fileBrowserPrivate.pinGDataFile([entry.toURL()], pin, callback);
+  },
+  canExecute: function(event, fileManager) {
+    var entry = CommandUtil.getSingleEntry(event, fileManager);
+    var gdata = entry && fileManager.metadataCache_.getCached(entry, 'gdata');
+
+    if (!fileManager.isOnGData() || entry.isDirectory || !gdata ||
+        gdata.hosted) {
+      event.canExecute = false;
+      event.command.setHidden(true);
+    } else {
+      event.canExecute = true;
+      event.command.setHidden(false);
+      event.command.checked = gdata.pinned;
+    }
+  }
+};
+
+/**
  * Creates zip file for current selection.
  */
 Commands.zipSelectionCommand = {