* Fix regression - configure asset bundle

* Fix formatting

* Read core platform kernel file during Dart initialization.

Currently service isolate is initialized from the source code parsed by VM.
This CL changes it so service isolate created during Dart initialization
is created from the kernel platform.dill file if it is present in the application
bundle. Then this platform kernel file is kept in dart_init module and reused
for application sciprt isolates.

* Reformat and merge

* Use accessor method

* Avoid passing running_from_kernel param. Add TODO for cleanup. Rename param.

* systems/settings channel split

* merge textScaleFactor and alwaysUse24HourFormat into flutter/settings channel

* add debugOverrideAlwaysUse24HourFormat

* implement textScaleFactor on iOS

* address comments

* remove debugOverrideAlwaysUse24HourFormat

* clang-format

It was accidently removed in a5e26f1f.

This registers a test font manager that maps all fonts to the Ahem font

* Fix RunBundleAndSource to run from kernel.

This is needed to accommodate restarting(rather than reload) of Flutter app from kernel.

* Fix formatting

Adds support for system text scale factor, including hooks for Android system settings changes.  iOS hooks will be added in another PR.

 - Assumes only the Dart VM is interested in idle notification.
 - Gives the VM the time remaining in each frame.
 - Gives the VM 100ms if there is no pending frame.

Issue flutter/flutter#9594

* Call weak_ptr.lock(), which returns a null shared_ptr and does not throw
* IsViewInvalid was inverted

* Fix Flutter loading from dill files.

* Remove disable of causal async stacks.

* Include mirrors patch files as they are needed for release/profile gen_snapshot

* Free the bytes

* Add FTL_DCHECK

**This is a breaking change on iOS**

Previously, the `paused` state was entered when the application resigned
active status. `inactive` now maps to this status. `paused` now maps to
an app that has been backgrounded.

`inactive` is currently emitted on iOS only and corresponds to iOS's
foreground inactive state.

Current state transitions are:
`resumed` <--> `inactive` <--> `paused`

suspending is currently emitted on Android only and corresponds to the
transition to Android's stopped state.

Current state transitions are:
`resumed` <--> `paused` --> `suspending` --> `resumed`

These transitions may change in future.

This is intended to match the exit codes returned by the Dart command line tool

The script will be finished when the microtask queue has been drained and
Dart_HasLivePorts is returning false for the main isolate

* This allows the tests to add their own FLX files but still use consistent fonts.
* The test fonts are only embedded on the desktop test shells. The option is not available on mobile platforms.
* Right now, all fonts will resolve to the test font. If we want tests to be able to use the fonts they embed in FLX files but use the test font for platform fallbacks, we will need to add font selector fallbacks. I can do this in an another patch. So far, there are no users of this functionality.

After this patch, we no longer link with Mojo. We still use some gn definitions
from //mojo to create Dart packages.

We no longer use mojom to transport messages. We still use the Mojo EDK
to spin the event loop, however.

Now they all flow through some common routines.

Now we just pass the data directly.

Previously, these signals were sent over Mojo. Now we send them through
platform messages.

Instead, just use JNI and Objective-C directly.

We no longer offer mojo handles via this mechanism.

This patch removes the use of the host messages mojom and switch all
message routing over to platform messages.