commit 0a5bb3d7a08957ac247f5d7c458b7a225d54d56c
author kouhei <kouhei@chromium.org> Thu Jul 07 09:47:31 2016
committer Commit bot <commit-bot@chromium.org> Thu Jul 07 09:49:01 2016
tree de52a25b4ea1edfca26ba7ae09d5fef3891be5bf
parent c1c1aaf75afe6ba160997504da93379793b1a26e

SegmentedString::prepend should know if the prepended string is new or previously consumed

This CL fixes the FIXME in SegmentedString::prepend partially.

This CL also fixes the test failures in upcoming CL: https://codereview.chromium.org/2121703002/
Before this CL, we messed up the m_numberOfCharactersConsumedPriorToCurrentString
counter when BackgroundHTMLInputStream is rewound for document.write inputs.

BUG=619141

Review-Url: https://codereview.chromium.org/2127043002
Cr-Commit-Position: refs/heads/master@{#404116}