Brazilian Portugese keyboard - Dead Keys and Compose Key Sequences not working on Linux

[cztomczak]

Initially reported on the forum:
https://groups.google.com/d/topic/cefpython/44J189xJYKg/discussion

Related upstream CEF issues:

• CEF Issue #2229 ("Dead Keys and Compose Key Sequences not working in Linux")
• CEF Issue #2039 ("Portugal (brazil) characters not input")
• CEF Issue #1813 ("CEF does not work with IMEs on Linux")

Related upstream CEF pull requests:

• CEF PR #127 ("Fix for IME not working on Linux (Issue 1813)")

Similar issues in Adobe Brackets that is using CEF:

• Keyboard pt_BR adobe/brackets#13721
• Can't type ' and " in Ubuntu 14.04 with International Keyboard adobe/brackets#10633