GitLab

- add trace event for RenderImage::paintIntoRect;
- fix name of decode & resize image events for tracing vs. old timeline;
- add processing of decode/resize/paint/imageref events to TimelineTraceEventBindings;
- generalize handling of additional event properties when building details, so that
    we avoid extra switches over event type by extracting properties relevant for
    details into TraceEvent properties;
- temporary workaround for crash on record stop in tests by cloning an AtomicString
    (see crbug.com/375242 for more details).

BUG=361045,375242

Review URL: https://codereview.chromium.org/308123008

git-svn-id: svn://svn.chromium.org/blink/trunk@175284 bbb929c8-8fbe-4397-9dbb-9b2b20218538