Move analyzer_benchmark to the devicelab (#157127)

We want this benchmark to run in the devicelab rather than on a VM so that it will give consistent results across runs.

First run (results at the bottom):
https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8733793239434768065/+/u/run_analyzer_benchmark/stdout
https://dart.googlesource.com/external/github.com/flutter/flutter/+/4ed8136610731e754f5f8c27878c6d1adf4d63f5

DEPS

diff --git a/DEPS b/DEPS
index d0070fb..a3261bf 100644
--- a/DEPS
+++ b/DEPS
@@ -283,7 +283,7 @@
 
   'engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '6f8321757f1b866a93cf4782a29f8bb0dd22ff5b',
 
-  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '0f6c8d6adf54e435b63dd761e49d020ca94445b9',
+  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '4ed8136610731e754f5f8c27878c6d1adf4d63f5',
 
   '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 8713190..e27866f 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "engine/src/flutter":"bf0b4f86238b18042d5810cddd0c2628e8ec92db",
   "engine/src/flutter/third_party/dart":"6f8321757f1b866a93cf4782a29f8bb0dd22ff5b",
-  "flutter":"0f6c8d6adf54e435b63dd761e49d020ca94445b9"
+  "flutter":"4ed8136610731e754f5f8c27878c6d1adf4d63f5"
 }
\ No newline at end of file