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The main usage of the keyCode attribute is to supports sending correct
soft key events. On the on-screen keyboard, each key should have the
keyCode attached, e.g. the key on the right side of TAB key, in US
keyboard layout, it has key:'q',code:'KeyQ',keyCode:0x51; while in FR
keyboard layout, it has key:'a',code:'KeyQ',keyCode:0x41.
Another example is for UK extended keyboard layout, the '#' key (at the
backslash key location), it has key:'#',code:'BackSlash',keyCode:0xDE;
while for US keyboard, it has key:'\\',code:'BackSlash',keyCode:0xDC.

A real case that this cl will fix is on FR on-screen keyboard, pressing
Ctrl+A will trigger Ctrl+Q shortcut.

BUG=355261
TEST=None

Review URL: https://codereview.chromium.org/346513003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278771 0039d316-1c4b-4281-b951-d872f2087c98