GitLab

The bulk of this change is to revert commit
0b15dad9. It isn't a direct revert due
to a number of things.
  - The ScopedComPtr interface that was widely used in the old patch no
    longer exists.
  - A number of interfaces change slightly (ImeTextSpans)
  - unsigned/signed compiler warnings

This code was abandoned a few years ago and removed from the repository
because it only worked in the Windows 8 Metro Mode of Chrome. Once that
mode was removed the supporting IME code was removed as well. The code
in its current form is functional but has issues which will be addressed
in follow up patches. It is desirable to move to TSF since there are
additional APIs that work via this API. Like text writing.

Functionality common to both input methods are placed in
InputMethodWinBase. InputMethodWin will be renamed to InputMethodWinImm32
in a followup patch.

This feature is currently disabled but can be enabled via
--enable-features=TSFImeSupport. No functionality changes are expected
with the Imm32 implementation.

Inputing text using Pinyin seems to work; as well as disabling DLL
injection (crbug.com/557798) allows the IME to work correctly with TSF.

There is some broken support with this change in that keydown/up messages,
arrow keys in the omnibox are not delivered. I intend to fix these in
followup changes being that this change is intended to make a previously
reverted change available under a command line flag.

BUG=657623

Change-Id: I89eb1a7ba6b9f95525df6fa83be5d923a03323b2
Reviewed-on: https://chromium-review.googlesource.com/916534
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541895}