IDL: Add forEach() method to iterable<>/maplike<>/setlike<> interfaces

Also add an implementation of forEach() in the Iterable<> helper class,
so that current interfaces get the new method for free.

BUG=432683

Review URL: https://codereview.chromium.org/807263007

git-svn-id: svn://svn.chromium.org/blink/trunk@189102 bbb929c8-8fbe-4397-9dbb-9b2b20218538
19 files changed
tree: 8c61b0ee4c20002ccd8477bcaa0d7e7b20421cbd
  1. third_party/