commit 70e3de94ab4b4a6ce2e9009f593f89aaf6eafdad
author sigbjornf <sigbjornf@opera.com> Sat Sep 26 18:08:22 2015
committer Commit bot <commit-bot@chromium.org> Sat Sep 26 18:09:40 2015
tree fd84cf17aad709748f8fd7389ea09dd931282ba0
parent c5598930514b13c0c36992e47d8b5170730001ce

Avoid creating duplicate Range objects when handling misspellings.

When iterating over the input text and marking its misspellings, avoid
creating duplicate Range objects from the check & paragraph EphemeralRanges
if they're identical.

This addresses a performance regression on trunk (non-Oilpan) for
blink_perf.dom.textarea-edit introduced by the EphemeralRange-switching
https://codereview.chromium.org/1331893002

R=haraken
BUG=530740

Review URL: https://codereview.chromium.org/1369713002

Cr-Commit-Position: refs/heads/master@{#351001}