Dependencies are now added between the drawTargets in GrPipeline

include/gpu/GrRenderTarget.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrRenderTarget_DEFINED
 #define GrRenderTarget_DEFINED
 
@@ skipping 147 matching lines @@
 protected:
     GrRenderTarget(GrGpu* gpu, LifeCycle lifeCycle, const GrSurfaceDesc& desc,
                    SampleConfig sampleConfig, GrStencilAttachment* stencil = nullptr)
         : INHERITED(gpu, lifeCycle, desc)
         , fStencilAttachment(stencil)
         , fSampleConfig(sampleConfig)
         , fLastDrawTarget(nullptr) {
         fResolveRect.setLargestInverted();
     }
 
+    ~GrRenderTarget() override;
+
     // override of GrResource
     void onAbandon() override;
     void onRelease() override;
 
 private:
     // Allows the backends to perform any additional work that is required for attaching a
     // GrStencilAttachment. When this is called, the GrStencilAttachment has already been put onto
     // the GrRenderTarget. This function must return false if any failures occur when completing the
     // stencil attachment.
     virtual bool completeStencilAttachment() = 0;
@@ skipping 11 matching lines @@
     // This back-pointer is required so that we can add a dependancy between
     // the drawTarget used to create the current contents of this renderTarget
     // and the drawTarget of a destination renderTarget to which this one is being drawn.
     GrDrawTarget* fLastDrawTarget;
 
     typedef GrSurface INHERITED;
 };
 
 
 #endif