Make pictures in multipicturedraw GM fit in 0,0..W,H range

Having the picture contents not actually reside in the 0,0..W,H range wrecks havoc with the layer hoisting. The hoisting works correctly but since the picture don't fulfill their contract the results look incorrect.

This CL just translates the picture's contents to the right so they are within the picture bound.

R=egdaniel@google.com

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/594363003
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