[VM] Introduce `--profile-startup` CLI flag

TEST=pkg/vm_service/test/profile_startup_cli_flag_test

Change-Id: I39bf67bf3157fe5700f1a62822f1dc3159c9bc96
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/438980
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Derek Xu <derekx@google.com>

https://dart.googlesource.com/sdk/+/9b89266f43084327cc53e33a67636ab166626267

DEPS

diff --git a/DEPS b/DEPS
index 970f7ea..a11a5a1 100644
--- a/DEPS
+++ b/DEPS
@@ -229,7 +229,7 @@
 ]
 
 deps = {
-  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '2254755d65a4b8c9bcce6489de9dee5233ac3077',
+  'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '9b89266f43084327cc53e33a67636ab166626267',
 
   'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '20788c07fcb8a0483e566f9b3261457b7fc49f01',
 

commits.json

diff --git a/commits.json b/commits.json
index ff5d728..46a4a9e 100644
--- a/commits.json
+++ b/commits.json
@@ -1,4 +1,4 @@
 {
   "flutter":"20788c07fcb8a0483e566f9b3261457b7fc49f01",
-  "flutter/engine/src/flutter/third_party/dart":"2254755d65a4b8c9bcce6489de9dee5233ac3077"
+  "flutter/engine/src/flutter/third_party/dart":"9b89266f43084327cc53e33a67636ab166626267"
 }
\ No newline at end of file