third_party: Add wayland library.

third_party/wayland/README.chromium

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+Name: wayland
+URL: http://wayland.freedesktop.org/
+Version: 1.9.0
+License: MIT
+License File: src/COPYING
+Security Critical: yes
+
+Description:
+Wayland is a protocol for a compositor to talk to its clients as well as a C
+library implementation of that protocol.
+
+Modifications:
+- None
+
+To import a new snapshot of wayland:
+- Checkout the latest release tag: git checkout 1.9.0
+- Change the DEPS entry to the newly checked out commit.
+- Update generated files:
+    ./autogen.sh && make
+    rsync -R $(git ls-files --others '*.h') ../include
+    rsync -R $(git ls-files --others 'protocol/*-protocol.c') ..
+- Update this README to reflect the new version number.