Include compositing reasons in the "debug" GraphicsLayer tree dump.

It's useful.

R=hartmanng@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/176963018

git-svn-id: svn://svn.chromium.org/blink/trunk@168489 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[blink] Avoid null pointer dereference in HitTestResult::isMisspelled()

The method HitTestResult::isMisspelled() assumed that renderer would
always be present in the right-clicked editable item. This is not the case
when right-clicking on an item in an editable combobox created by jQuery
Searchable DropDown Plugin (http://jsearchdropdown.sf.net).

This patch changes HitTestResult::isMisspelled() to check if the renderer
is present. If there's no renderer, then the method returns false (there
shouldn't be spellcheck related items in the context menu).

Manual test 1: Click on the drop-down on http://jsearchdropdown.sf.net and
right-click on any of the items. The page should not crash.

Manual test 2: Run the following script and right-click anywhere on the
page. The page should not crash.

<html>
<head>
<script>
window.onload = function() {
  var element = document.getElementsByTagName('html')[0];
  document.adoptNode(element);
  var newElement = document.createElementNS('http://www.w3.org/2000/svg', 'title');
  document.appendChild(newElement);
  document.execCommand('SelectAll', false)
  document.designMode = 'on';
};
</script>
</head>
</html>

TEST=LayoutTests/editing/spelling/right-click-no-renderer-crash.html
BUG=304165

Review URL: https://codereview.chromium.org/26168008

git-svn-id: svn://svn.chromium.org/blink/trunk@168490 bbb929c8-8fbe-4397-9dbb-9b2b20218538