Add r8lib target for performance testing

Change-Id: If40952ee64d008ecfff45371db299f135e1e6b8c
diff --git a/build.gradle b/build.gradle
index 93d7e1b..7ff46eb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -702,6 +702,11 @@
     workingDir = projectDir
 }
 
+task R8LibApiOnly {
+    dependsOn r8LibCreateTask("Api", "src/main/keep.txt", R8NoManifest, r8LibPath)
+    outputs.file r8LibPath
+}
+
 task R8LibNoDeps {
     dependsOn r8LibCreateTask(
             "NoDeps",
diff --git a/tools/golem_build.py b/tools/golem_build.py
index d55def1..30d46bc 100755
--- a/tools/golem_build.py
+++ b/tools/golem_build.py
@@ -8,8 +8,8 @@
 import gradle
 import sys
 
-GRADLE_ARGS = ['--no-daemon', '-Pno_internal']
-BUILD_TARGETS = ['R8', 'D8', 'R8Lib', 'buildExampleJars', 'CompatDx',
+GRADLE_ARGS = ['--no-daemon']
+BUILD_TARGETS = ['R8', 'D8', 'R8LibApiOnly', 'buildExampleJars', 'CompatDx',
                  'downloadAndroidCts', 'downloadDx']
 
 def Main():