Fix debug code in GrDrawingManager

Looks like this code got a little dusty.

Change-Id: Iac0f475abac9d0891e34bba59ddbde3ec63d065a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/328176
Auto-Submit: Adlai Holler <adlai@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrDrawingManager.cpp b/src/gpu/GrDrawingManager.cpp
index 823f941..fea1c1e 100644
--- a/src/gpu/GrDrawingManager.cpp
+++ b/src/gpu/GrDrawingManager.cpp
@@ -289,13 +289,13 @@
 
 #if 0
     // Enable this to print out verbose GrOp information
-    SkDEBUGCODE(SkDebugf("onFlush renderTasks:"));
+    SkDEBUGCODE(SkDebugf("onFlush renderTasks (%d):\n", fOnFlushRenderTasks.count()));
     for (const auto& onFlushRenderTask : fOnFlushRenderTasks) {
-        SkDEBUGCODE(onFlushRenderTask->dump();)
+        SkDEBUGCODE(onFlushRenderTask->dump(/* printDependencies */ true);)
     }
-    SkDEBUGCODE(SkDebugf("Normal renderTasks:"));
-    for (int i = 0; i < fRenderTasks.count(); ++i) {
-        SkDEBUGCODE(fRenderTasks[i]->dump();)
+    SkDEBUGCODE(SkDebugf("Normal renderTasks (%d):\n", fDAG.numRenderTasks()));
+    for (int i = 0; i < fDAG.numRenderTasks(); ++i) {
+        SkDEBUGCODE(fDAG.renderTask(i)->dump(/* printDependencies */ true);)
     }
 #endif