Instead, just use JNI and Objective-C directly.

Add plunbing for Host-to-Dart platform messages

We'll use the plumbing in this direction for things like key events.

After this patch, platform messages now take the same path through the system
that semantics data does (on Android). Support on iOS will be in another patch.

This fixes this Fuchsia build, which uses the latest //lib/ftl.

We only ever had one UIDelegate. We might as well have people use the Engine
interface directly.

If the platform requests setting up the resource context without making the context current, don’t attempt to create the GL native interface. (#3059)

* Namespaces have been updated to reflect the move from //flutter/sky/shell to //flutter/shell.
* shell/BUILD.gn file has been split into smaller GN files for each subcomponent of the shell (common, GPU, diagnostic, testing).
* GN dependencies have been rewritten to stop exposing common shell dependencies as public. Duplicates have also been removed.
* GPU subcomponent has been updated make it more suitable for Vulkan integration.
* The GLFW backend has been resurrected.

We need to block in the surfaceChanged callback until we can swap the GL
surface with some content in order to avoid flashing transparent and then
black.

Fixes https://github.com/flutter/flutter/issues/5373

This pulled a refactoring of how we keep track of the primary threads.

This patch hides the base::SingleThreadedTaskRunner, which pulls a big
switchover to ftl::WeakPtr and std::function.

This required us to fix a backwards dependency from flutter/lib/ui to
sky/shell.

PlatformViews are owned by the UI thread

Add collection of PlatformViews to the Shell and allow them to be queried over the service protocol (#2861)

Recreate the EGL surface after a resize in order to correctly handle screen rotation on Android (#2813)

Remove dependencies on ui, third_party/mesa and mojo/convertors. Provide simple alternatives. (#2783)

After this patch, we can execute Dart code and draw the result via MGL. We
still need to plumb in services.

The term ViewportObserver doesn't mean anything. This interface has evolved to
control the engine. This new name reflects that.

TBR=eseidel@google.com

Review URL: https://codereview.chromium.org/1222663003.

This CL makes it possible to build sky_shell on Linux. It doesn't do much, but
it doesn't crash on startup. The goal is to evetually be able to test sky_shell
on the bots and to be able to run the test_sky on Mac.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1202323002.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1169983005.

This CL prepares us to create an iOS version of SkyShell by moving the
Android-specific bits into an android directory.

R=chinmaygarde@google.com

Review URL: https://codereview.chromium.org/1139873004

Previously, we weren't scheduling a visual update when our surface was created,
so we'd just continue to show black until the author requested a new animation
frame. After this CL, we schedule a visual update as soon as our surface is
created.

As part of this change, I've removed knowledge of the GPU delegate from
PlatformView. Now, all the calls from PlatformView to the GPU system bounce
through the UI delegate, which serializes the commands with other commands from
the UI engine to the GPU rasterizer.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/974483004

We still don't quite handle multitouch correctly, but single touches work now.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/932283002

This CL contains enough plumbing for Sky to render content to the screen using
Ganesh in SkyShell. We're still missing the ability to load data off the
network.

R=eseidel@chromium.org, ojan@chromium.org

Review URL: https://codereview.chromium.org/936883002

This CL plumbs resize notifications from SkyView to Engine. I've taken the
opportunity to reorganize how notifications generated by SkyView are plumbed to
the GPU and UI threads. This approach should reduce the amount of plumbing
needed for new notifications.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/880443003

This CL teaches SkyShell how to initialize GL and draw a green square.

R=eseidel@google.com, eseidel@chromium.org

Review URL: https://codereview.chromium.org/890803004