https://bugs.webkit.org/show_bug.cgi?id=49714

Reviewed by Alexey Proskuryakov.

WebCore:

IE chooses a font which shows a yensign for 0x5c code point for a page
encoded in x-mac-japanese, ISO-2022-JP, EUC-JP, Shift_JIS, Shift_JIS_X0213-2000,
x-sjis, and Windows-31J.
We have emulated this behavior by replacing 0x5c with 0xa5 for EUC-JP and
Shift_JIS_X0213-2000. This change adds other encodings above.

Also, we move the HashSet initialization for isJapanese() and
backslashAsCurrencySymbol() to TextEncodingRegistry.cpp because of
ease of making them multi-thread safe.

* platform/text/TextEncoding.cpp:
(WebCore::TextEncoding::isJapanese): Just calls isJapaneseEncoding().
(WebCore::TextEncoding::backslashAsCurrencySymbol): Uses shouldShowBackslashAsCurrencySymbolIn().
* platform/text/TextEncodingRegistry.cpp:
(WebCore::addEncodingName): Moved from TextEncoding.cpp, and stop using atomicCanonicalTextEncodingName().
(WebCore::buildQuirksSets): Added. Initializes HashSets for isJapaneseEncoding() and shouldShowBackslashAsCurrencySymbolIn().
(WebCore::isJapaneseEncoding):
(WebCore::shouldShowBackslashAsCurrencySymbolIn):
(WebCore::extendTextCodecMaps): Add a call to buildQuirksSets().
* platform/text/TextEncodingRegistry.h:

LayoutTests:

Use Shift_JIS instead of Shift_JIS_X0213-2000 because Shift_JIS_X0213-2000
encoding is available only on Mac.
Add a test for ISO-2022-JP.

* editing/selection/find-yensign-and-backslash-expected.txt:
* editing/selection/find-yensign-and-backslash.html:
* platform/chromium/test_expectations.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@73566 268f45cc-cd09-0410-ab3c-d52691b4dbfc