Question: What position did the Diyawadana Nilame of the Temple of Sacred Tooth Relic hold from 1900 - 1964?

Context paragraphs:
Kandy Esala Perahera: The Kandy Esala Perahera (the Esala procession of Kandy) also known as The Festival of the Tooth is a grand festival celebrated with elegant costumes and is held in July and August in Kandy, Sri Lanka.  This historical procession is held annually to pay homage to the Sacred Tooth Relic of Lord Buddha, which is housed at the Sri Dalada Maligawa in Kandy.  A unique symbol of Sri Lanka, the procession consists of many traditional local dances such as fire-dances, whip-dances, Kandyan dances and various other cultural dances, in addition to the elephants who are usually adorned with lavish garments.  The festival ends with the traditional "diya-kepeema" ritual, a water cutting ceremony which is held at the Mahaweli River at Getambe, Kandy.

1998 Temple of the Tooth attack: 1998 Temple of the Tooth attack is an attack on the Temple of the Tooth Relic, located in Kandy, Sri Lanka.  The shrine, which is considered to be important to the Buddhists in Sri Lanka, houses the relic of the tooth of the Buddha, and is also a UNESCO designated World Heritage Site.  In 1998, it was attacked by Liberation Tigers of Tamil Eelam (LTTE), a separatist militant organization which fought to create an independent Tamil state in Northern and Eastern parts of the country, from 1983 to 2009.

Andaw-thein Temple: Andaw Thein (Burmese: အံတော်သိမ်ဘုရား , ] ) is a temple in Mrauk U located at the northwest corner of the Shite-thaung Temple.  The name means 'Tooth Shrine'.  It contains a tooth relic of the Buddha coming from Sri Lanka.  It was first built as an ordination hall between 1515 and 1521 by King Thazata, and restored by Min Bin between 1534 and 1542.  It was later expanded into a temple by King Raza II in order to house a tooth relic of the Buddha he brought back from his pilgrimage to Ceylon, either in 1596 or 1606–1607.

Harris Leuke Ratwatte: Harris Leuke Ratwatte (known as Harris Leuke Ratwatte Dissawa ) (1900 - 1964) was a Ceylonese legislator.  He was a member of the State Council of Ceylon, Parliament and the Senate of Ceylon.  Ratwatte was also appointed a Dissawa and was elected as the Diyawadana Nilame of Sri Dalada Maligawa, Kandy.

Pradeep Nilanga Dela: Wanigasekara Wanasinghe Mudiyanse Ralahamilage Pradeep Nilanga Dela (known as Pradeep Nilanga Dela; Sinhala:ප්‍රදීප් නිලංග දෑල) is the present Diyawadana Nilame or Chief Custodian of Sri Dalada Maligawa and 19th Diyawadana Nilame.  He acted as the Basnayake Nilame of Ruhunu Maha Kataragama devalaya and Sabaragamu Maha Saman devalaya, before being elected to the post of Diyawadana Nilame on July 1, 2005.

Royal Palace of Kandy: The Royal Palace of Kandy ("Maligawa") in Kandy, was the royal residence of the Sinhalese monarchy of the Kingdom of Kandy in Sri Lanka.  The last king to reside in it was King Sri Vikrama Rajasinha until he was overthrown by the British in 1815 with the aid of Kandian chieftains.  Once part of a large palace complex that included the King's Palace ("Raja Wasala"), Royal Audience Hall ("Magul Maduwa"), Queen's Palace ("Meda Wasala"), King's Harem Quarters ("Palle Vahale") and Queen's Bathing Pavilion ("Ulpange"), together with the Temple of the Tooth ("Sri Dalada Maligawa") that held the Relic of the tooth of the Buddha.  By ancient tradition the one who was in possession of the "Tooth Relic" had claim to the throne.  Adjacent to the Royal Palace is the Victorian era building that until recently housed Kandy High Court.

Diyawadana Nilame: Diyawadana Nilame is the office of chief lay custodian of Temple of the Tooth, Kandy, Sri Lanka.  Formerly an office of the royal household, today it remains a prestigious position, enriched with over two thousand years of history to safeguard and carry out ancient rituals for the relic of the tooth of the Buddha.  The Diyawadana Nilame has the responsibility of overseeing of all aspects of the Sri Dalada Maligawa.  He has the traditional duty of organizing the annual pageant, the Kandy Esala Perahera.  The current Diyawadana Nilame is Pradeep Nilanga Dela.

Temple of the Tooth: Sri Dalada Maligawa or the Temple of the Sacred Tooth Relic is a Buddhist temple in the city of Kandy, Sri Lanka.  It is located in the royal palace complex of the former Kingdom of Kandy, which houses the relic of the tooth of the Buddha.  Since ancient times, the relic has played an important role in local politics because it is believed that whoever holds the relic holds the governance of the country.  Kandy was the last capital of the Sri Lankan kings and is a World Heritage Site mainly due to the temple.

Heen Banda Udurawana: Heen Banda Udurawana (15 December 1900 – 31 August 1989) was a member of the Senate of Ceylon and Diyawadana Nilame of the Temple of the Tooth, Kandy.

1989 Temple of the Tooth attack: 1989 Temple of the Tooth attack is an attack on the Temple of the Tooth Relic, located in Kandy, Sri Lanka.  The shrine, which is considered to be important to the Buddhists in Sri Lanka, houses the relic of the tooth of the Buddha, and is a UNESCO designated World Heritage Site.  It was attacked on 8 February 1989, allegedly by the armed cadres affiliated to Janatha Vimukthi Peramuna (JVP), a Marxist-Leninist Communist political party in Sri Lanka.

Supporting paragraphs: Harris Leuke Ratwatte Temple of the Tooth
Answer: Ceylonese legislator