deferred canvas

dm/DM.cpp

Index: dm/DM.cpp
diff --git a/dm/DM.cpp b/dm/DM.cpp
index eb61fd786b543087a88885759d92b22ff9c5307e..05109922c3b54987c5705c86dce4b01bb68990e2 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -73,6 +73,9 @@ DEFINE_int32(shards, 1, "We're splitting source data into this many shards.");
 DEFINE_int32(shard,  0, "Which shard do I run?");
 
 DEFINE_string(mskps, "", "Directory to read mskps from, or a single mskp file.");
+DEFINE_bool(defer, false, "Run raster through SkDeferredCanvas");
+
+bool gUseDeferredCanvas;
 
 using namespace DM;
 using sk_gpu_test::GrContextFactory;
@@ -1255,6 +1258,8 @@ int dm_main() {
     setbuf(stdout, nullptr);
     setup_crash_handler();
 
+    gUseDeferredCanvas = FLAGS_defer;
+
     if (FLAGS_verbose) {
         gVLog = stderr;
     } else if (!FLAGS_writePath.isEmpty()) {