Add choke point for modifying non-AA rect draws (e.g., applying clipping)

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 408 matching lines @@
     }
 
     if (this->caps()->useDrawInsteadOfClear()) {
         // This works around a driver bug with clear by drawing a rect instead.
         // The driver will ignore a clear if it is the only thing rendered to a
         // target before the target is read.
         if (rect == &rtRect) {
             drawContext->discard();
         }
 
-        // TODO: flip this into real draw!
-        GrPipelineBuilder pipelineBuilder;
-        pipelineBuilder.setXPFactory(GrPorterDuffXPFactory::Make(SkXfermode::kSrc_Mode));
+        SkRect scalarRect = SkRect::Make(*rect);
 
-        SkRect scalarRect = SkRect::Make(*rect);
-        SkAutoTUnref<GrDrawBatch> batch(
-                GrRectBatchFactory::CreateNonAAFill(color, SkMatrix::I(), scalarRect,
-                                                    nullptr, nullptr));
-        this->drawBatch(pipelineBuilder, drawContext, GrNoClip(), batch);
+        GrPaint paint;
+        paint.setColor4f(GrColor4f::FromGrColor(color));
+        paint.setXPFactory(GrPorterDuffXPFactory::Make(SkXfermode::kSrc_Mode));
+
+        drawContext->drawRect(GrNoClip(), paint, SkMatrix::I(), scalarRect);
     } else {
         GrBatch* batch = new GrClearBatch(*rect, color, drawContext->accessRenderTarget());
         this->recordBatch(batch);
         batch->unref();
     }
 }
 
 void GrDrawTarget::discard(GrRenderTarget* renderTarget) {
     if (this->caps()->discardRenderTargetSupport()) {
         GrBatch* batch = new GrDiscardBatch(renderTarget);
@@ skipping 124 matching lines @@
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void GrDrawTarget::clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* rt) {
     GrBatch* batch = new GrClearStencilClipBatch(rect, insideClip, rt);
     this->recordBatch(batch);
     batch->unref();
 }