Allow minification to be toggled for wasm builds (#171211)

Provides extra minification controls for web builds. Updates the
existing `--minify` flag to pass its value to both JS and wasm (instead
of just JS).

Also adds two new flags `--minify-js` and `--minify-wasm` which toggle
minification for just one of the web targets. While JS minification has
a huge impact on code size, wasm minification has a much smaller effect
on the program's size. Since minification can obfuscate useful info
(like errors) one may want to turn off minification for wasm but leave
it on for JS.

The plan is to temporarily use `--no-minify-wasm` for devtools to help
debug some exceptions being seen.

---------

Co-authored-by: Nate Biggs <natebiggs@google.com>
https://dart.googlesource.com/external/github.com/flutter/flutter/+/85486ffffc164cc8f7eeeca31603a83b620a088d

DEPS

diff --git a/DEPS b/DEPS
index e344ee5..94fcd29 100644
--- a/DEPS
+++ b/DEPS
@@ -237,7 +237,7 @@
 deps = {
   'flutter/engine/src/flutter/third_party/dart': Var('dart_git') + '/sdk' + '@' + '8f95ae58b450aa17731795a8c23cdf824c76e273',
 
-  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '771b631eae0af2eadb29816c8b45f4398efe963e',
+  'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '85486ffffc164cc8f7eeeca31603a83b620a088d',
 
   'flutter/engine/src/flutter/third_party/depot_tools':
   Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '580b4ff3f5cd0dcaa2eacda28cefe0f45320e8f7',
@@ -819,7 +819,7 @@
      'packages': [
        {
         'package': 'fuchsia/sdk/core/linux-amd64',
-        'version': 'mQv6OKiD6nn3FNUYG_mxPGDCIPJeBCWrOl3q18ZZ8J0C'
+        'version': 'paQphLeTdjksq0VgKHhi7zPqEnFYuDrtXDQjXkE802oC'
        }
      ],
      'condition': 'download_fuchsia_deps and not download_fuchsia_sdk',

commits.json

diff --git a/commits.json b/commits.json
index 08e72c1..4246d00 100644
--- a/commits.json
+++ b/commits.json
@@ -1,4 +1,4 @@
 {
-  "flutter":"771b631eae0af2eadb29816c8b45f4398efe963e",
+  "flutter":"85486ffffc164cc8f7eeeca31603a83b620a088d",
   "flutter/engine/src/flutter/third_party/dart":"8f95ae58b450aa17731795a8c23cdf824c76e273"
 }
\ No newline at end of file