DM: don't run rtree when kSkipTiled is set.

Follow up to http://crrev.com/165723009, which changed this in GM.

Tested: out/Debug/dm

BUG=skia:
R=scroggo@google.com, senorblanco@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/175283002

git-svn-id: http://skia.googlecode.com/svn/trunk@13537 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/dm/DMReplayTask.cpp b/dm/DMReplayTask.cpp
index 3b47962..763684a 100644
--- a/dm/DMReplayTask.cpp
+++ b/dm/DMReplayTask.cpp
@@ -41,7 +41,7 @@
     }
 
     if (FLAGS_rtree && fUseRTree) {
-        return false;
+        return fGM->getFlags() & skiagm::GM::kSkipTiled_Flag;
     }
     if (FLAGS_replay && !fUseRTree) {
         return false;