A picture records drawing calls (via the canvas returned by beginRecording) and can then play them back (via picture.draw(canvas) or canvas.drawPicture).

SkImage is an abstraction for drawing a rectagle of pixels, though the particular type of image could be actually storing its data on the GPU, or as drawing commands (picture or PDF or otherwise), ready to be played back into another canvas.

Returns the canvas that records the drawing commands.

Do the commands in input match the supplied pattern? Note: this is a pretty heavy-weight operation since we are drawing the picture into a debug canvas to extract the commands. -Do the commands in input match the supplied pattern? Note: this is a