Support inputmode using InputScope for Windows8 desktop.
ImmSetConversionStatus doesn't work on Windows8:
http://msdn.microsoft.com/en-us/library/windows/desktop/hh994466.aspx
So we need to use InputScope to tell IME conversion modes(Hiragana, Katakana..).
BUG=244688
TEST=manually done with windows8 desktop using hardware keyboard and onscreen keyboard. Both MS-IME and GoogleJapaneseInput works with hardware keyboard. Unfortunately, onscreen keyboard with MS-IME doesn't work but with GoogleJapaneseIME works.
I wrote another CL to implement setting target InputScope(IS_KANA, IS_KATAKANA_FULLWIDTH and IS_ALPHANUMERIC_FULLWIDTH) using COM interface, which is ITextStoreACP::RetrieveRequestedAttrs.
http://src.chromium.org/viewvc/chrome/trunk/src/ui/base/ime/win/tsf_text_store.cc
And try "chrome --enable-text-services-framework" on Windows8 desktop.
I found that
1. Both MS-IME and GoogleJapaneseInput work fine (changing conversion mode "kana", "katakana" and "full-width-latin") with hardware keyboard input.
2. With onscreen keyboard, GoogleJapaneseInput works but MS-IME doesn't.
This behavior is same as this CL's try.
Additionally, I try to use CSS ime-mode property with IE10.
http://msdn.microsoft.com/en-us/library/ff521067.aspx
ime-mode property also sets IME status simply ON/OFF.
I got same result to above. So using IMEs with hardware keyboard works but only onscreenkeyboard-MSIME pair fails.
In my conclusion, Windows8 onscreen keyboard with MS-IME takes a somewhat wrong with InputScope.
Review URL: https://chromiumcodereview.appspot.com/22794002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@220221 0039d316-1c4b-4281-b951-d872f2087c98
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