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d6cbdb4081
We can't have two copies of |embedder.dart| or |shell.dart| because they take ownership of some underlying Mojo handles. Instead of duplicating the code, this CL makes the old locations just export all the symbols from the new location. I've also done the same with fetch.dart to avoid code duplication. Finally, I've removed image_cache.dart in the old location because the only clients already live in the new world and ought to use the new location. TBR=ianh@google.com Review URL: https://codereview.chromium.org/1179923004.
SKY SDK
Sky and Sky's SDK are designed as layered frameworks, where each layer depends on the ones below it but could be replaced wholesale.
The bottom-most layer is the Sky Platform, which is exposed to Dart
code as the dart:sky package.
Above this are the files in the painting/ directory, which provide APIs related to drawing graphics.
Layout primitives are provided in the next layer, found in the
rendering/ directory. They use dart:sky and the
APIs exposed in painting/ to provide a retained-mode layout and
rendering model for applications or documents.
Widgets are provided by the files in the widgets/ directory, using a reactive framework.
Text input widgets are layered on this mechanism and can be found in the editing2/ directory.