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e582a0c54e
This PR connects the view ID provided by the rasterizer to `EmbedderExternalViewEmbedder`'s presenting call (see `embedder_external_view_embedder.cc`). This PR also contains a refactor (which actually takes the majority of LOC) that moves the specification of view ID from `PrepareFlutterView` to `SubmitFlutterView`. The `flutter_view_id` parameter in `PrepareFlutterView` was added in https://github.com/flutter/engine/pull/46169. It turns out that we don't need the view ID throughout the preparation phase, so we can delay the specification to submission, which makes it feel cleaner. ### Tests Existing tests are changed to verify that `SubmitFlutterView` receive the correct view ID. The feature that `EmbedderExternalViewEmbedder` sends the view ID to the presenting API is not tested for now, because `EmbedderExternalViewEmbedder` is typically tested in `embedder_unittests`, but it requires the embedder API `AddView`. It will be tested in later changes to `EmbedderExternalViewEmbedder`. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
Flow
Flow is a simple compositor based on Skia that the Flutter engine uses to cache recorded paint commands and pixels generated from those recordings. Flow runs on the raster thread and uploads information to Skia.