Remove canTweakAlphaForCoverage from XP's since batch reads flag.

BUG=skia:

Review URL: https://codereview.chromium.org/1127693002

3 files changed, 1 insertions, 11 deletions

diff --git a/src/gpu/effects/GrCustomXfermodePriv.h b/src/gpu/effects/GrCustomXfermodePriv.h
index 216fb62d43..edcdcc0a6e 100644
--- a/src/gpu/effects/GrCustomXfermodePriv.h
+++ b/src/gpu/effects/GrCustomXfermodePriv.h
@@ -64,10 +64,6 @@ public:
         return true;
     }
 
-    bool canTweakAlphaForCoverage() const override {
-        return false;
-    }
-
     void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
                             GrXPFactory::InvariantOutput*) const override;
 
diff --git a/src/gpu/effects/GrDisableColorXP.h b/src/gpu/effects/GrDisableColorXP.h
index 9bbe24d757..f5fe4fd6f1 100644
--- a/src/gpu/effects/GrDisableColorXP.h
+++ b/src/gpu/effects/GrDisableColorXP.h
@@ -23,8 +23,6 @@ public:
         return true;
     }
 
-    bool canTweakAlphaForCoverage() const override { return true; }
-
     void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI,
                             GrXPFactory::InvariantOutput* output) const override {
         output->fBlendedColorFlags = 0;
diff --git a/src/gpu/effects/GrPorterDuffXferProcessor.cpp b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
index b2c81754a1..506383a29e 100644
--- a/src/gpu/effects/GrPorterDuffXferProcessor.cpp
+++ b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
@@ -591,10 +591,6 @@ bool GrPorterDuffXPFactory::supportsRGBCoverage(GrColor /*knownColor*/,
     return false;
 }
 
-bool GrPorterDuffXPFactory::canTweakAlphaForCoverage() const {
-    return can_tweak_alpha_for_coverage(fDstCoeff);
-}
-
 void GrPorterDuffXPFactory::getInvariantOutput(const GrProcOptInfo& colorPOI,
                                                const GrProcOptInfo& coveragePOI,
                                                GrXPFactory::InvariantOutput* output) const {
@@ -672,7 +668,7 @@ bool GrPorterDuffXPFactory::willReadDstColor(const GrDrawTargetCaps& caps,
         return false;
     }
 
-    if (this->canTweakAlphaForCoverage()) {
+    if (can_tweak_alpha_for_coverage(fDstCoeff)) {
         return false;
     }