SkQP: fix five tests

set `skia_use_expat` to true:
  - coloremoji_blendmodes
  - scaledemoji
  - scaledemojipos

disable bad tests:
  - arcs_as_paths
  - ovals_as_paths

Change-Id: I883cf13f54b424b8d3964fc045bd6282cbc028c9
Reviewed-on: https://skia-review.googlesource.com/c/196644
Reviewed-by: Ben Wagner <bungeman@google.com>
Cherry-Pick: e7e803e3a96948526c52220941594b0a6d3cdc24
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/197014
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>

tools/skqp/bad_gms.txt

@@ -1,4 +1,6 @@
+arcs_as_paths
 drawbitmaprect
 drawbitmaprect-imagerect
+ovals_as_paths
 p3
 skbug1719

tools/skqp/generate_gn_args

@@ -17,7 +17,7 @@ skia_enable_fontmgr_empty = true
 skia_enable_pdf = false
 skia_skqp_global_error_tolerance = 8
 skia_use_dng_sdk = false
-skia_use_expat = false
+skia_use_expat = true
 skia_use_icu = false
 skia_use_libheif = false
 skia_use_lua = false

tools/skqp/gn_to_bp.py

@@ -130,7 +130,7 @@ gn_args = {
   'skia_enable_fontmgr_empty': 'true',
   'skia_enable_pdf':           'false',
   'skia_enable_skottie':       'false',
-  'skia_use_expat':            'false',
+  'skia_use_expat':            'true',
   'skia_use_dng_sdk':          'false',
   'skia_use_icu':              'false',
   'skia_use_lua':              'false',