DevTools: wire lazy decoding instrumentation to LazyDecodingPixelRef.cpp

having instrumentation on the cc level is too fragile.

BUG=323015

Review URL: https://codereview.chromium.org/88333002

git-svn-id: svn://svn.chromium.org/blink/trunk@162694 bbb929c8-8fbe-4397-9dbb-9b2b20218538