Handle accent keys from physical keyboards.

Handle accent keys from physical keyboards.

BUG=230921
Review URL: https://codereview.chromium.org/759033002
Cr-Commit-Position: refs/heads/master@{#307474}
(cherry picked from commit 13ff5ad10cb62596ebd35e27ab9dbb002dcada17)


Fix problem with accents caused by race condition.

The deleting of the temporary accent character will cause the pending accent
to be cleared so we have to keep it around for the keypress and separately
record what the new pending-accent will be once we're done.

BUG=230921
Review URL: https://codereview.chromium.org/834293002
Cr-Commit-Position: refs/heads/master@{#310164}
(cherry picked from commit b9ef84152bce335b4814175204744ea2d5b148b4)


BUG=230921
TBR=bcwhite

Committed: https://chromium.googlesource.com/chromium/src/+/554f71edfbb0c03a80b2e243b5d3aef76f9e6b69

[bcwhite, 2015-01-12 17:41:29]

bcwhite@chromium.org changed reviewers:
+ matthewyuan@chromium.org, mnaganov@chromium.org

[bcwhite, 2015-01-12 18:17:55]

Committed patchset #1 (id:1) manually as
554f71edfbb0c03a80b2e243b5d3aef76f9e6b69 (presubmit successful).