Revert of Dependencies are now added between the drawTargets in GrPipeline (patchset #5 id:100001 of https://codereview.chromium.org/1414903002/ )

Reason for revert:
this may have broken the TSAN and ASAN bots

Original issue's description:
> Dependencies are now added between the drawTargets in GrPipeline
>
> This CL relies on https://codereview.chromium.org/1414773002/ (Add the machinery to GrDrawTarget to enable topological sorting)
>
> BUG=skia:4094
>
> Committed: https://skia.googlesource.com/skia/+/45a1c34f607a970933e5cd05e1df6cd8090db1be

TBR=bsalomon@google.com,robertphillips@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4094

Review URL: https://codereview.chromium.org/1419613005

src/gpu/GrDrawTarget.cpp

@@ -32,14 +32,13 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
-GrDrawTarget::GrDrawTarget(GrRenderTarget* rt, GrGpu* gpu, GrResourceProvider* resourceProvider)
+GrDrawTarget::GrDrawTarget(GrGpu* gpu, GrResourceProvider* resourceProvider)
     : fGpu(SkRef(gpu))
     , fResourceProvider(resourceProvider)
     , fFlushState(fGpu, fResourceProvider, 0)
     , fFlushing(false)
     , fFirstUnpreparedBatch(0)
-    , fFlags(0)
-    , fRenderTarget(rt) {
+    , fFlags(0) {
     // TODO: Stop extracting the context (currently needed by GrClipMaskManager)
     fContext = fGpu->getContext();
     fClipMaskManager.reset(new GrClipMaskManager(this));
@@ -51,10 +50,6 @@ GrDrawTarget::GrDrawTarget(GrRenderTarget* rt, GrGpu* gpu, GrResourceProvider* r
 }
 
 GrDrawTarget::~GrDrawTarget() {
-    if (fRenderTarget && this == fRenderTarget->getLastDrawTarget()) {
-        fRenderTarget->setLastDrawTarget(nullptr);
-    }
-
     fGpu->unref();
 }
 
@@ -187,7 +182,7 @@ void GrDrawTarget::flush() {
     // drawTargets will be created to replace them if the SkGpuDevice(s) write to them again.
     this->makeClosed();
 
-    // Loop over the batches that haven't yet generated their geometry
+    // Loop over all batches and generate geometry
     for (; fFirstUnpreparedBatch < fBatches.count(); ++fFirstUnpreparedBatch) {
         fBatches[fFirstUnpreparedBatch]->prepare(&fFlushState);
     }
@@ -232,10 +227,6 @@ void GrDrawTarget::drawBatch(const GrPipelineBuilder& pipelineBuilder, GrDrawBat
         return;
     }
 
-#ifdef ENABLE_MDB
-    batch->pipeline()->addDependenciesTo(fRenderTarget);
-#endif
-
     this->recordBatch(batch);
 }
 
@@ -467,10 +458,6 @@ void GrDrawTarget::copySurface(GrSurface* dst,
                                const SkIPoint& dstPoint) {
     GrBatch* batch = GrCopySurfaceBatch::Create(dst, src, srcRect, dstPoint);
     if (batch) {
-#ifdef ENABLE_MDB
-        this->addDependency(src);
-#endif
-
         this->recordBatch(batch);
         batch->unref();
     }

src/gpu/GrDrawTarget.h

@@ -45,7 +45,7 @@ class GrDrawTarget final : public SkRefCnt {
 public:
     // The context may not be fully constructed and should not be used during GrDrawTarget
     // construction.
-    GrDrawTarget(GrRenderTarget* rt, GrGpu* gpu, GrResourceProvider*);
+    GrDrawTarget(GrGpu* gpu, GrResourceProvider*);
 
     ~GrDrawTarget() override;
 
@@ -314,7 +314,6 @@ private:
 
     // 'this' drawTarget relies on the output of the drawTargets in 'fDependencies'
     SkTDArray<GrDrawTarget*>                    fDependencies;
-    GrRenderTarget*                             fRenderTarget;
 
     typedef SkRefCnt INHERITED;
 };

src/gpu/GrDrawingManager.cpp

@@ -105,7 +105,7 @@ GrDrawTarget* GrDrawingManager::newDrawTarget(GrRenderTarget* rt) {
     }
 #endif
 
-    GrDrawTarget* dt = new GrDrawTarget(rt, fContext->getGpu(), fContext->resourceProvider());
+    GrDrawTarget* dt = new GrDrawTarget(fContext->getGpu(), fContext->resourceProvider());
 
     *fDrawTargets.append() = dt;
 

src/gpu/GrPipeline.cpp

@@ -8,7 +8,6 @@
 #include "GrPipeline.h"
 
 #include "GrCaps.h"
-#include "GrDrawTarget.h"
 #include "GrGpu.h"
 #include "GrPipelineBuilder.h"
 #include "GrProcOptInfo.h"
@@ -131,35 +130,6 @@ GrPipeline* GrPipeline::CreateAt(void* memory, const CreateArgs& args,
     return pipeline;
 }
 
-static void add_dependencies_for_processor(const GrFragmentProcessor* proc, GrRenderTarget* rt) {
-    for (int i = 0; i < proc->numChildProcessors(); ++i) {
-        // need to recurse
-        add_dependencies_for_processor(&proc->childProcessor(i), rt);
-    }
-
-    for (int i = 0; i < proc->numTextures(); ++i) {
-        GrTexture* texture = proc->textureAccess(i).getTexture();
-        SkASSERT(rt->getLastDrawTarget());
-        rt->getLastDrawTarget()->addDependency(texture);
-    }
-}
-
-void GrPipeline::addDependenciesTo(GrRenderTarget* rt) const {
-    for (int i = 0; i < fFragmentProcessors.count(); ++i) {
-        add_dependencies_for_processor(fFragmentProcessors[i].get(), rt);
-    }
-
-    if (fXferProcessor.get()) {
-        const GrXferProcessor* xfer = fXferProcessor.get();
-
-        for (int i = 0; i < xfer->numTextures(); ++i) {
-            GrTexture* texture = xfer->textureAccess(i).getTexture();   
-            SkASSERT(rt->getLastDrawTarget());
-            rt->getLastDrawTarget()->addDependency(texture);
-        }
-    }
-}
-
 void GrPipeline::adjustProgramFromOptimizations(const GrPipelineBuilder& pipelineBuilder,
                                                 GrXferProcessor::OptFlags flags,
                                                 const GrProcOptInfo& colorPOI,

src/gpu/GrPipeline.h

@@ -84,9 +84,6 @@ public:
     ///////////////////////////////////////////////////////////////////////////
     /// @name GrFragmentProcessors
 
-    // Make the renderTarget's drawTarget (if it exists) be dependent on any
-    // drawTargets in this pipeline
-    void addDependenciesTo(GrRenderTarget* rt) const;
 
     int numColorFragmentProcessors() const { return fNumColorProcessors; }
     int numCoverageFragmentProcessors() const {

src/gpu/GrRenderTarget.cpp

@@ -71,10 +71,7 @@ void GrRenderTarget::onAbandon() {
 
 void GrRenderTarget::setLastDrawTarget(GrDrawTarget* dt) {
     if (fLastDrawTarget) {
-        // The non-MDB world never closes so we can't check this condition
-#ifdef ENABLE_MDB
         SkASSERT(fLastDrawTarget->isClosed());
-#endif
     }
 
     fLastDrawTarget = dt;