Increase RBE usage for ART tests to 40%

Test: m art-run-test-{host,target,jvm}-data
Change-Id: I0fdf2a9ccea3f75f583dfbd2c3f8435ae8e5b5b5
diff --git a/test/art_build_rules.py b/test/art_build_rules.py
index 7d83bd4..ad05aff 100644
--- a/test/art_build_rules.py
+++ b/test/art_build_rules.py
@@ -32,8 +32,8 @@
 from shutil import rmtree
 from os import remove
 
-USE_RBE_FOR_JAVAC = 10    # Percentage of tests that can use RBE (between 0 and 100)
-USE_RBE_FOR_D8 = 10       # Percentage of tests that can use RBE (between 0 and 100)
+USE_RBE_FOR_JAVAC = 40    # Percentage of tests that can use RBE (between 0 and 100)
+USE_RBE_FOR_D8 = 40       # Percentage of tests that can use RBE (between 0 and 100)
 
 def rm(*patterns):
   for pattern in patterns: