Enable stencil clipping in mixed sampled render targets

src/gpu/gl/GrGLRenderTarget.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLRenderTarget.h"
 
 #include "GrRenderTargetPriv.h"
@@ skipping 29 matching lines @@
     fRTLifecycle            = idDesc.fLifeCycle;
 
     fViewport.fLeft   = 0;
     fViewport.fBottom = 0;
     fViewport.fWidth  = desc.fWidth;
     fViewport.fHeight = desc.fHeight;
 
     fGpuMemorySize = this->totalSamples() * this->totalBytesPerSample();
 
     SkASSERT(fGpuMemorySize <= WorseCaseSize(desc));
+
+    fSampleLocationsConfig = kDefault_SampleLocationsConfig;
 }
 
 GrGLRenderTarget* GrGLRenderTarget::CreateWrapped(GrGLGpu* gpu,
                                                   const GrSurfaceDesc& desc,
                                                   const IDDesc& idDesc,
                                                   int stencilBits) {
     GrGLStencilAttachment* sb = nullptr;
     if (stencilBits) {
         GrGLStencilAttachment::IDDesc sbDesc;
         GrGLStencilAttachment::Format format;
@@ skipping 140 matching lines @@
 int GrGLRenderTarget::totalSamples() const {
   int total_samples = this->msaaSamples();
 
   if (fTexFBOID != kUnresolvableFBOID) {
       // If we own the resolve buffer then that is one more sample per pixel.
       total_samples += 1;
   }
 
   return total_samples;
 }