Implement difference clip rects with window rectangles

src/gpu/GrDrawTarget.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawTarget.h"
 
 #include "GrAuditTrail.h"
@@ skipping 361 matching lines @@
             return;
         }
     }
     args.fOpts.fColorPOI.completeCalculations(
         sk_sp_address_as_pointer_address(pipelineBuilder.fColorFragmentProcessors.begin()),
         pipelineBuilder.numColorFragmentProcessors());
     args.fOpts.fCoveragePOI.completeCalculations(
         sk_sp_address_as_pointer_address(pipelineBuilder.fCoverageFragmentProcessors.begin()),
         pipelineBuilder.numCoverageFragmentProcessors());
     args.fScissor = &appliedClip.scissorState();
+    args.fWindows = &appliedClip.windows();
     args.fHasStencilClip = appliedClip.hasStencilClip();
     if (!this->setupDstReadIfNecessary(pipelineBuilder, drawContext->accessRenderTarget(),
                                        clip, args.fOpts,
                                        &args.fDstTexture, batch->bounds())) {
         return;
     }
 
     if (!batch->installPipeline(args)) {
         return;
     }
@@ skipping 219 matching lines @@
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void GrDrawTarget::clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* rt) {
     GrBatch* batch = new GrClearStencilClipBatch(rect, insideClip, rt);
     this->recordBatch(batch, batch->bounds());
     batch->unref();
 }