Fixing analysis_canvas treatment of save layers with src xfermode

skia/ext/analysis_canvas.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 #include "skia/ext/analysis_canvas.h"
 #include "third_party/skia/include/core/SkDraw.h"
 #include "third_party/skia/include/core/SkRRect.h"
 #include "third_party/skia/include/core/SkShader.h"
@@ skipping 400 matching lines @@
       SetForceNotSolid(true);
     }
   }
 
   // If after we draw to the save layer, we have to blend with the current
   // layer using any part of the current layer's alpha, then we can
   // conservatively say that the canvas will not be transparent.
   SkXfermode::Mode xfermode = SkXfermode::kSrc_Mode;
   if (paint)
     SkXfermode::AsMode(paint->getXfermode(), &xfermode);
-  if (xfermode != SkXfermode::kSrc_Mode) {
+  if (xfermode != SkXfermode::kDst_Mode) {
     if (force_not_transparent_stack_level_ == kNoLayer) {
       force_not_transparent_stack_level_ = saved_stack_size_;
       SetForceNotTransparent(true);
     }
   }
 
   INHERITED::willSaveLayer(bounds, paint, flags);
   // Actually saving a layer here could cause a new bitmap to be created
   // and real rendering to occur.
   return kNoLayer_SaveLayerStrategy;
@@ skipping 12 matching lines @@
       force_not_transparent_stack_level_ = kNoLayer;
     }
   }
 
   INHERITED::willRestore();
 }
 
 }  // namespace skia