Role organization:

Delete useless files
percona-xtrbackup is optional on Wheezy (unless you use percona apt)
better organization in mysql vendors

tasks/install/mariadb/default.yml

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+---
+
+- name: SHELL | Get MariaDB target version
+  shell: LANG=C apt-cache depends mariadb-server | awk -F '-' '/Depends/ { print $NF }'
+  register: apt_mariadb_version
+  changed_when: false
+
+- name: DEBCONF | Prepare MariaDB silent installation (root password)
+  debconf: name='mariadb-server-{{ apt_mariadb_version.stdout }}' question='mysql-server/root_password' vtype='password' value='{{ mysql_root_password }}'
+  when: not mysql_exists.stat.exists
+
+- name: DEBCONF | Prepare MariaDB silent installation (root password again)
+  debconf: name='mariadb-server-{{ apt_mariadb_version.stdout }}' question='mysql-server/root_password_again' vtype='password' value='{{ mysql_root_password }}'
+  when: not mysql_exists.stat.exists
+
+- name: APT | Install MariaDB server
+  apt: pkg=mariadb-server state=latest
+

tasks/install/mariadb/upstream.yml

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+---
+
+- name: APT | Install MariaDB key
+  apt_key: keyserver="keyserver.ubuntu.com" id="0xcbcb082a1bb943db" state=present
+
+- name: APT | Add MariaDB repository
+  apt_repository: repo='deb {{ mariadb_repository }} {{ ansible_distribution_release }} main' state=present
+
+- name: APT | Add MariaDB (src) repository
+  apt_repository: repo='deb-src {{ mariadb_repository }} {{ ansible_distribution_release }} main' state=present
+
+- name: INCLUDE | Normal Install
+  include: default.yml
+