Android: Disable lint & errorprone for official builds

Static analysis will have already run on non-official bots, so
these checks don't need to be run again on official bots. Both
steps are a bit slow, so they are meaningful to disable.

Change-Id: I8d56c0046f88c0746e1e8129721e49b0325419f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880157Reviewed-by: Ben Mason <benmason@chromium.org>
Commit-Queue: Ben Mason <benmason@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709518}

build/config/android/config.gni

@@ -179,8 +179,10 @@ if (is_android || is_chromeos) {
     # Mark APKs as android:debuggable="true".
     debuggable_apks = !is_official_build
 
-    # Set to false to disable the Errorprone compiler
-    use_errorprone_java_compiler = true
+    # Set to false to disable the Errorprone compiler.
+    # Defaults to false for official builds to reduce build times.
+    # Static analysis failures should have been already caught by normal bots.
+    use_errorprone_java_compiler = !is_official_build
 
     # Build incremental targets whenever possible.
     # See //build/android/incremental_install/README.md for more details.
@@ -191,7 +193,9 @@ if (is_android || is_chromeos) {
     update_android_aar_prebuilts = false
 
     # Turns off android lint. Useful for prototyping or for faster local builds.
-    disable_android_lint = false
+    # Defaults to true for official builds to reduce build times.
+    # Static analysis failures should have been already caught by normal bots.
+    disable_android_lint = is_official_build
 
     # Location of aapt2 used for app bundles. For now, a more recent version
     # than the one distributed with the Android SDK is required.