The doodle features a moonlit riverside scene which progresses to the sound of the piece, the third movement of his most famous piano suites, Suite bergamasque (1890–1905). Lights in the streets and houses flicker on and off in time to the music as the silhouettes of cars, boats and cyclists pass by, smoke rises from chimneys and rain begins to fall.
The animation ends with two people in different boats crossing paths on the river and sharing a red umbrella.
Here’s a screenshot, but go here to see the whole thing, and be sure to press the red “start” button on the balloon at the beginning:
My favorite Debussy piece is “La Mer” (“The sea”). If you have 24 minutes to spare, listen to this version by the London Symphony Orchestra: