Thanks for feedback, confirms what I thought...
 
I met the same issue with Google Native Client actually. In that case I 
ended up doing the image get in the C++ too, and rendering using the 
pp::Graphics2D API. When using pp::Graphics2D::ReplaceContents it seemed 
that the browser was smart about reusing buffers (as documented). 
Conceivably, moving these operations into the C++ might make more sense 
with emscripten too - I'm not sure what APIs are available to the C++.
 
ben

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