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This patch does a few things: - Changes ownership of the LazyGlyphAtlas to ContentContext from Canvas. This means that drawings with multiple canvases (e.g. calls to DrawPicture) share the same lazy atlas. - Moves the scale property from Font::Metrics to FontGlyphPair. Font::Metrics contains properties related to the font, whereas scale has to do with the properties of the drawing at render time and is independent of the font. - Makes the lazy atlas manage FontGlyphPair::Set rather than vectors of TextFrames. - Makes the determination of font scaling at EntityPass::Render rather than Canvas::DrawTextFrame. The scaling may be altered by calls to Canvas::DrawPicture by render time and otherwise get missed. This is done via a new method: Contents::PopulateGlyphAtlas, which is only implemented by TextContents in this patch. - Fixes up some miscelleaneous bugs in Font::Metrics hashing and unused/dead code. This improves over prior attempts: LazyGlyphAtlas ownership is now unambiguous, and glyph scaling happens correctly for all rendered glyphs regardless of the order of canvas operations in Aiks. Fixes flutter/flutter#130142