Refugee from Dead Machine 4: MDB Monster

src/gpu/GrDrawTarget.h

Index: src/gpu/GrDrawTarget.h
diff --git a/src/gpu/GrDrawTarget.h b/src/gpu/GrDrawTarget.h
index cf3137fe7c68fc44c6a3fd9fe2b782ec098eb700..a08f1ca8bda2c411a933467dcd295e1a02e75cda 100644
--- a/src/gpu/GrDrawTarget.h
+++ b/src/gpu/GrDrawTarget.h
@@ -32,14 +32,18 @@
 #include "SkTypes.h"
 #include "SkXfermode.h"
 
-//#define ENABLE_MDB 1
+#define ENABLE_MDB 1
 
 class GrBatch;
 class GrClip;
 class GrCaps;
+class GrFoo;
 class GrPath;
 class GrDrawPathBatchBase;
 class GrPathRangeDraw;
+class GrDrawContext;
+class GrDrawTarget;
+
 
 class GrDrawTarget final : public SkRefCnt {
 public:
@@ -47,6 +51,22 @@ public:
     // construction.
     GrDrawTarget(GrRenderTarget* rt, GrGpu* gpu, GrResourceProvider*);
 
+    ///////////////////////////////////////////////////////////////////////////
+    bool isEmpty3() const {
+        return fBatches.count() == 0;
+    }
+
+    void addRequiredDep(GrDrawTarget* srcDT) {
+        *fRequired.push() = srcDT;
+    }
+
+    // fRequired dependances are from the TextureAccess system
+    SkTDArray<GrDrawTarget*> fRequired;
+
+    GrRenderTarget* rt_delete_me() { return fRenderTarget; }
+
+    ///////////////////////////////////////////////////////////////////////////
+
     ~GrDrawTarget() override;
 
     void makeClosed() {
@@ -295,6 +315,8 @@ private:
                            GrScissorState*,
                            const SkRect* devBounds);
 
+    void checkUses() const;
+
     void addDependency(GrDrawTarget* dependedOn);
 
     // Used only by CMM.