Adding a visibility property to cr.ui.table.TableColumn.

ui/webui/resources/js/cr/ui/table/table_column_model.js

Index: ui/webui/resources/js/cr/ui/table/table_column_model.js
diff --git a/ui/webui/resources/js/cr/ui/table/table_column_model.js b/ui/webui/resources/js/cr/ui/table/table_column_model.js
index da7803a0a13c810cfed967c7ad30cf2b9949afac..d159fd50a94dfd77935f2c9f24197a1064c63825 100644
--- a/ui/webui/resources/js/cr/ui/table/table_column_model.js
+++ b/ui/webui/resources/js/cr/ui/table/table_column_model.js
@@ -97,12 +97,16 @@ cr.define('cr.ui.table', function() {
       if (index < 0 || index >= this.columns_.size - 1)
         return;
 
+      var column = this.columns_[index];
       width = Math.max(width, MIMIMAL_WIDTH);
-      if (width == this.columns_[index].width)
+      if (width == column.absoluteWidth)
         return;
 
-      this.columns_[index].width = width;
-      cr.dispatchSimpleEvent(this, 'resize');
+      column.width = width;
+
+      // Dispatch an event if a visible column was resized.
+      if (column.visible)
+        cr.dispatchSimpleEvent(this, 'resize');
     },
 
     /**
@@ -183,6 +187,35 @@ cr.define('cr.ui.table', function() {
       }
       return -1;
     },
+
+    /**
+     * Show/hide a column.
+     * @param {number} index The column index.
+     * @param {boolean} visible The column visibility.
+     */
+    setVisible: function(index, visible) {
+      if (index < 0 || index > this.columns_.size - 1)
+        return;
+
+      var column = this.columns_[index];
+      if (column.visible == visible)
+        return;
+
+      // Changing column visibility alters the width.  Save the total width out
+      // first, then change the column visibility, then relayout the table.
+      var contentWidth = this.totalWidth;
+      column.visible = visible;
+      this.normalizeWidths(contentWidth);
+    },
+
+    /**
+     * Returns a column's visibility.
+     * @param {number} index The column index.
+     * @return {boolean} Whether the column is visible.
+     */
+    isVisible: function(index) {
+      return this.columns_[index].visible;
+    }
   };
 
   return {