Add hitTestChildren to baseline-aligned stack (#172485)

Fixes http://github.com/flutter/flutter/issues/171510
https://dart.googlesource.com/external/github.com/flutter/flutter/+/6a3ebfe3f3ebe3efbc5b875f9a9dac1cfe14526d

DEPS

diff --git a/DEPS b/DEPS
index f589a92..aad47f4 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': '4aba494b81081bdb94c6d7654f288143454fc8e3',
+  'skia_revision': 'eea1c33fbe847bfc13e3805a19e95cea6b7834b5',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.
@@ -231,7 +231,7 @@
 deps = {
   'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '35b09df976bad92bfa7f3d141fa3fb44a9d57736',
 
-  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '3ceb2e0a48cefa9714b6575f2e04d55f0d850e36',
+  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '6a3ebfe3f3ebe3efbc5b875f9a9dac1cfe14526d',
 
   'flutter/engine/src/flutter/third_party/depot_tools':
   Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '580b4ff3f5cd0dcaa2eacda28cefe0f45320e8f7',

commits.json

diff --git a/commits.json b/commits.json
index c6aaede..52985e2 100644
--- a/commits.json
+++ b/commits.json
@@ -1,4 +1,4 @@
 {
-  "flutter":"3ceb2e0a48cefa9714b6575f2e04d55f0d850e36",
+  "flutter":"6a3ebfe3f3ebe3efbc5b875f9a9dac1cfe14526d",
   "flutter/engine/src/flutter/third_party/dart":"35b09df976bad92bfa7f3d141fa3fb44a9d57736"
 }
\ No newline at end of file