Add XP to handle the cases where we disable color write.

src/gpu/GrOptDrawState.cpp

Index: src/gpu/GrOptDrawState.cpp
diff --git a/src/gpu/GrOptDrawState.cpp b/src/gpu/GrOptDrawState.cpp
index d12cf0cad5f2aa0bea47218ba1ab9cc3e0222776..5e19871b8c9b2020272a98701b67775108a368b7 100644
--- a/src/gpu/GrOptDrawState.cpp
+++ b/src/gpu/GrOptDrawState.cpp
@@ -53,7 +53,6 @@ GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
 
         optFlags = xferProcessor->getOptimizations(colorPOI,
                                                    coveragePOI,
-                                                   drawState.isColorWriteDisabled(),
                                                    drawState.getStencil().doesWrite(),
                                                    &overrideColor,
                                                    caps);
@@ -86,9 +85,6 @@ GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
     if (drawState.isHWAntialias()) {
         fFlags |= kHWAA_Flag;
     }
-    if (drawState.isColorWriteDisabled()) {
-        fFlags |= kDisableColorWrite_Flag;
-    }
     if (drawState.isDither()) {
         fFlags |= kDither_Flag;
     }