[cfe] Add LookupResult

This replaces the individual lookups of getables and setables in LookupScope and NameSpace with single lookup that returns a LookupResult holding both the getable and the setable. This prepares for having getter/setter pairs in the same SourcePropertyBuilder and avoids the need for AccessErrorBuilder for handling lookups of getters where only setters exist and vice versa.

Change-Id: I2b1e2477ed43506d9f94c48acd4b44277b490540
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/420080
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Reviewed-by: Erik Ernst <eernst@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>

https://dart.googlesource.com/sdk/+/0dde2121500b69b4841951bd01351a039247a208

DEPS

diff --git a/DEPS b/DEPS
index 89ded22..822b8b3 100644
--- a/DEPS
+++ b/DEPS
@@ -14,7 +14,7 @@
   'flutter_git': 'https://flutter.googlesource.com',
   'skia_git': 'https://skia.googlesource.com',
   'llvm_git': 'https://llvm.googlesource.com',
-  'skia_revision': '7d56b9cc7ce95828f7e2afa692483b78a820af2e',
+  'skia_revision': '3ea44c88d37b478e115aefcd50ed985de70d8d58',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.
@@ -238,7 +238,7 @@
 ]
 
 deps = {
-  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '76581515c188be686a2d0fbcbca6b6429be3263e',
+  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '0dde2121500b69b4841951bd01351a039247a208',
 
   'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '277d899bb74656070361125dc56e90cf61db410c',
 

commits.json

diff --git a/commits.json b/commits.json
index 7825470..7afd7a2 100644
--- a/commits.json
+++ b/commits.json
@@ -1,4 +1,4 @@
 {
   "flutter":"277d899bb74656070361125dc56e90cf61db410c",
-  "flutter/engine/src/flutter/third_party/dart":"76581515c188be686a2d0fbcbca6b6429be3263e"
+  "flutter/engine/src/flutter/third_party/dart":"0dde2121500b69b4841951bd01351a039247a208"
 }
\ No newline at end of file