Tests snapshot command log for trace-based Timeline paint event


Paint command log:
    div#a drawRect
    div#b drawRect
    div#alttext-container drawRect
    div#alttext-container drawRect
    div#alttext-container drawRect
    div#alttext-container drawRect
    img#alttext-image drawBitmapRectToRect
    rect#e drawRect


Add expected result for paint-command-log-nodes.html
Add expected result for paint-command-log-nodes.html

https://codereview.chromium.org/792883004  removed the expected result.

BUG=441388
TBR=rtoy@chromium.org,lushnikov@chromium.org

Review URL: https://codereview.chromium.org/802483002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@186988 bbb929c8-8fbe-4397-9dbb-9b2b20218538
