Support inputmode using InputScope for Windows8 metro.

Support inputmode using InputScope for Windows8 metro.

Chrome runs in TSF mode at Windows8 metro.
We use COM interface ITextStoreACP::RetrieveRequestedAttrs to tell InputScope to IME in the mode.
TSFTextStore, which implements ITextStoreACP, knows target inputmode through TextInputClient::GetTextInputMode and get InputScope using tsf_inputscope::CreateInputScope appending to text input type.
RenderWidgetHostViewWin implements TextInputClient::GetTextInputMode.

BUG=244688
TEST=Run "chrome --enable-text-services-framework --enable-input-mode-attribute" at windows8 desktop and tests manually 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. But there might be some issue in onscreen keyboard with MS-IME.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=220511

[yoichio, 2013-08-28 08:30:33]

Please review.

[Yohei Yukawa, 2013-08-28 08:32:45]

lgtm

[Seigo Nonaka, 2013-08-29 01:05:14]

lgtm

[yoichio, 2013-08-29 01:20:43]

Add sky@ as an OWNER.
Could you look at?

[sky, 2013-08-29 15:34:21]

LGTM

[commit-bot: I haz the power, 2013-08-29 23:26:14]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/yoichio@chromium.org/23542003/1

[commit-bot: I haz the power, 2013-08-30 05:37:56]

Change committed as 220511