Update XPF invariant info to not account for conflation

src/gpu/GrDrawContext.cpp

 
 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAARectRenderer.h"
 #include "GrBatch.h"
@@ skipping 394 matching lines @@
             }
             // Does the rect bound the RT?
             SkPoint srcSpaceRTQuad[4];
             invM.mapRectToQuad(srcSpaceRTQuad, rtRect);
             if (rect_contains_inclusive(rect, srcSpaceRTQuad[0]) &&
                 rect_contains_inclusive(rect, srcSpaceRTQuad[1]) &&
                 rect_contains_inclusive(rect, srcSpaceRTQuad[2]) &&
                 rect_contains_inclusive(rect, srcSpaceRTQuad[3])) {
                 // Will it blend?
                 GrColor clearColor;
-                if (paint.isOpaqueAndConstantColor(&clearColor)) {
+                if (paint.isConstantBlendedColor(&clearColor)) {

[Chris Dalton, 2015/06/02 00:07:36]

Is this the usual path where rects get replaced by clears? I think it might have
had a bug where it wouldn't a catch, for example, a fullscreen clear to
trans-black since the output color wasn't opaque.

[bsalomon, 2015/06/02 13:44:33]

It is and I think you're right about that.

                     fDrawTarget->clear(NULL, clearColor, true, rt);
                     return;
                 }
             }
         }
     }
 
     GrColor color = paint.getColor();
     SkRect devBoundRect;
     bool needAA = paint.isAntiAlias() && !pipelineBuilder.getRenderTarget()->isMultisampled();
@@ skipping 840 matching lines @@
     return DrawVerticesBatch::Create(geometry, type, viewMatrix,
                                      positions.begin(), vertexCount,
                                      indices.begin(), hasIndices ? vertexCount : 0,
                                      colors.begin(),
                                      texCoords.begin(),
                                      bounds);
 }
 
 #endif