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Previously the code would only set the resolution on the FrameMetrics when the scroll ID was equal to ROOT_SCROLL_ID. This only happens on the root scrollable frame for a layer tree. However, with bug 732971 fixed, any presShell can have a resolution associated with it, so we need to populate the mResolution for any layer that is the root scrollable layer for a presShell. On platforms like Fennec and Metro the content presShell is a sub-presShell of the root presShell. The resolution is set on the content presShell, but would not get populated on the FrameMetrics correctly because of this condition. The #ifdef ANDROID hack a few lines below was used to work around this on Fennec but it was broken on Metro. This change corrects the behaviour on both of these platforms.
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