Generate package config during gclient runhooks and update BUILD.gn to reference it

Roll Dart from version 69aba23 to 06cb010

dart-lang/sdk@06cb010247 Revert "Add unawaited to package:meta"
dart-lang/sdk@6de0f53e7c [CFE] Set correct async markers in outline phase (2nd try)
dart-lang/sdk@b6a0c50bf6 [dart2js] Support conversion of local function type variables from K to J model
dart-lang/sdk@0ce83987d6 Reland "[SDK] Adds an SDK hash to kernels and the VM."
dart-lang/sdk@315ecf2606 Roll benchmarks-internal to 88af52754f272e7a4c5737b7e003c2ed9e8a754f
dart-lang/sdk@3b25d6ff69 Add DynamicType, NeverType, and VoidType to API.
dart-lang/sdk@11632ff4d4 Add buildSdkSummary() to analyzer API.
dart-lang/sdk@431b57cbbb Add an additional category into completion_metrics.dart: parameter references
dart-lang/sdk@4140853675 [dart2js/ddc] Add null checks to with<X|Y|Z|W> methods
dart-lang/sdk@0d44449aaa Add unawaited to package:meta
dart-lang/sdk@be0f94b218 [dart2js] include dart:_js_annotations into the platform file by default
dart-lang/sdk@d9d4e5ccb3 copy package config changes to the modular_suite_nnbd.dart
dart-lang/sdk@9547628ecf [ddc] Compare types with new DartTypeEquivalence
dart-lang/sdk@f42889fbb8 create package_config.json files in ddc modular test suite
dart-lang/sdk@b4c60e6e1c [dart2js] Removing switch class restrictions.
dart-lang/sdk@935b69e676 [vm] Increase alignment in the blob container format to 16k.
dart-lang/sdk@901fa79db1 [vm] Prevent bare instructions code from clobbering decisions about which instructions to include.
dart-lang/sdk@1478b2b71c Prepare to publish analyzer 0.39.12
dart-lang/sdk@1a60f94fd0 Add two failing tests in the local_reference_contributor_test.dart, after some for(var foo ...) ^, the completion is in the implicit statement which is in the scope of the foo declaration.
dart-lang/sdk@1b1fcc0618 update package:test in the sdk
dart-lang/sdk@68bcf1b28a [dartdev] add --enable-experiment support to 'dart test'
dart-lang/sdk@34ad5a5908 Don't reuse LSP error code that triggers shutdown for refactor errors
dart-lang/sdk@5d1fbe0497 [cfe] Handle unforseen type parameter intersections
dart-lang/sdk@878e2cacdd [CFE] Don't issue an initialization error when trying to initialize when not having a platform
dart-lang/sdk@34f5c9d0b4 [cfe] Implement new async return rules
dart-lang/sdk@3a4aad6b87 [cfe] Use test description uri for expectation file location
dart-lang/sdk@fa650e46dd Implement the verbose option for dart analyze
dart-lang/sdk@b3c9e89028 Roll benchmarks-internal ee36753c0b4b..e6a5aa28c884
dart-lang/sdk@c40ebbc65e [ DartDev ] Ignore SIGINT in DartDev process
dart-lang/sdk@bda4994482 Analyzer: Finish using ///-style comments.
dart-lang/sdk@42d2996773 Analyzer: Move NON_BOOL_* tests to diagnostics/

…sed (#19546)

…tion is active. (#19592)

UIKit does not guarantee that the application is in the active state when it
lays out it subviews. However, in `viewDidLayoutSubviews`, Flutter attempts to
create the render surface and wait for the first frame. These operations require
GPU access which is forbidden when in the background on iOS. This layout while
in the background only seems to happen under very specific circumstances as
described in the reproducible test case. Notably, this behavior cannot be
reproduced when the application is just launched with the "Background Fetch"
XCode run scheme. The other instance of invocations to create the rendering
surface have been audited and I can confirm that those are already in the
correct lifecycle callbacks. This was the only instance where the surface
creation was in a non-lifecycle callback.

Fixes flutter/flutter#55969
(This issue has a clear reproducible test case and was used as the basis for
verification.)
Fixes flutter/flutter#57676
(This is significantly harder to reproduce but the issue looks to be the same. I
tried this patch on multiple devices overnight and could not reproduce this.)

This underlying cause here was identified by the enhanced GPU error reporting
introduced in iOS 14. I am not able to submit those patches because the Beta
builders are not available on infra. I will submit those when available so that
issues like this have more actionable error messages in the future.