Auto merge of #25777 - kunalmohan:24720-ImageCache, r=jdm

Take origin from current window instead of creating a new one in event of reflow

Everytime a new `LayoutContext` was created, it created a new origin which
caused endless stream of image loads to occur in case of reflow. The reason
for this was that the existing image, although cached successfully, was not
used because the entry in hashmap did not match because of different(new)
origin.
This is solved by storing the origin of a window in enum `ScriptReflow` and
used in creating new `LayoutContext` in case of reflow.

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r?@jdm

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- [X] These changes fix #24720  (GitHub issue number if applicable)

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