R=reed@google.com
TBR=reed@google.com
Author: scroggo@google.com
Review URL: https://codereview.chromium.org/
319493004
/** Returns a non-zero, unique value corresponding to the pixels in our
pixelref. Each time the pixels are changed (and notifyPixelsChanged
is called), a different generation ID will be returned. Finally, if
- their is no pixelRef then zero is returned.
+ there is no pixelRef then zero is returned.
*/
uint32_t getGenerationID() const;