Reland crrev.com/c/2078772: Add Android to SkiaRenderer field trial

Bug: 1019787
Change-Id: I82cfdc3c76d0c7e1ef9a9a9939aa8b209ff9dd7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087428Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746940}

testing/variations/fieldtrial_testing_config.json

@@ -5768,6 +5768,7 @@
     "UseSkiaRenderer": [
         {
             "platforms": [
+                "android",
                 "linux",
                 "windows"
             ],