BookmarkModel changes for multiple level undo and redo of bookmarks.

Staged commit of a larger feature to ease review and landing the change.

- New BookmarkModelObserver entries to be alerted before an action is
  executed.
- BookmarkModel ability to explicitly reorder all children of a bookmark
  tree.  Support function also added to TreeNode for this operation.
- Test updated BookmarkModel and BookmarkModelObserver changes.

BUG=126092

Review URL: https://chromiumcodereview.appspot.com/16479003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205228 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 8 insertions, 0 deletions

diff --git a/ui/base/models/tree_node_model.h b/ui/base/models/tree_node_model.h
index 5bfe46e..0ab6ff8 100644
--- a/ui/base/models/tree_node_model.h
+++ b/ui/base/models/tree_node_model.h
@@ -101,6 +101,14 @@ class TreeNode : public TreeModelNode {
     children_.weak_clear();
   }
 
+  // Removes all existing children without deleting the nodes and adds all nodes
+  // contained in |children| into this node as children.
+  void SetChildren(const std::vector<NodeType*>& children) {
+    RemoveAll();
+    for (size_t i = 0; i < children.size(); ++i)
+      Add(children[i], i);
+  }
+
   // Returns the parent node, or NULL if this is the root node.
   const NodeType* parent() const { return parent_; }
   NodeType* parent() { return parent_; }