Add ash perftest on background blur filter.

ash/perftests/DEPS

Index: ash/perftests/DEPS
diff --git a/ash/perftests/DEPS b/ash/perftests/DEPS
new file mode 100644
index 0000000000000000000000000000000000000000..1b7370f47be8777708049baad6fd34a20a7d2046
--- /dev/null
+++ b/ash/perftests/DEPS
@@ -0,0 +1,5 @@
+specific_include_rules = {
+  "ash_background_filter_blur_perftest.cc": [
+    "+cc/base"
+  ],
+}