Add skia_paths try bots.

BUG=pdfium:1147

Change-Id: I3a91e4c6f5cb7063f19bf4a6a707e9d9bbbf4914
Reviewed-on: https://pdfium-review.googlesource.com/42352
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>

infra/config/cq.cfg

diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index 96d300e..2045cd4 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -44,6 +44,9 @@
         name: "linux_skia"
       }
       builders {
+        name: "linux_skia_paths"
+      }
+      builders {
         name: "linux_xfa"
       }
       builders {
@@ -68,6 +71,9 @@
         name: "mac_skia"
       }
       builders {
+        name: "mac_skia_paths"
+      }
+      builders {
         name: "mac_xfa"
       }
       builders {
@@ -89,6 +95,9 @@
         name: "win_skia"
       }
       builders {
+        name: "win_skia_paths"
+      }
+      builders {
         name: "win_xfa"
       }
       builders {