Revert of removing equality / compute invariant loops from GrGeometryProcessors

src/gpu/GrAtlasTextContext.cpp

Index: src/gpu/GrAtlasTextContext.cpp
diff --git a/src/gpu/GrAtlasTextContext.cpp b/src/gpu/GrAtlasTextContext.cpp
index cc9bde25fd67e0088cfefa0697126939c69bb883..c2c76edec31dbf0de21f7a940ed35ac07d4a975d 100644
--- a/src/gpu/GrAtlasTextContext.cpp
+++ b/src/gpu/GrAtlasTextContext.cpp
@@ -1493,10 +1493,14 @@
                                             texture));
         } else {
             GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kNone_FilterMode);
+
+            // This will be ignored in the non A8 case
+            bool opaqueVertexColors = GrColorIsOpaque(this->color());
             gp.reset(GrBitmapTextGeoProc::Create(this->color(),
                                                  texture,
                                                  params,
                                                  fMaskFormat,
+                                                 opaqueVertexColors,
                                                  localMatrix));
         }
 
@@ -1959,6 +1963,7 @@
                                                          flags);
         } else {
             flags |= kColorAttr_DistanceFieldEffectFlag;
+            bool opaque = GrColorIsOpaque(color);
 #ifdef SK_GAMMA_APPLY_TO_A8
             U8CPU lum = SkColorSpaceLuminance::computeLuminance(fGamma, filteredColor);
             float correction = (*fDistanceAdjustTable)[lum >> kDistanceAdjustLumShift];
@@ -1967,13 +1972,15 @@
                                                         texture,
                                                         params,
                                                         correction,
-                                                        flags);
+                                                        flags,
+                                                        opaque);
 #else
             return GrDistanceFieldA8TextGeoProc::Create(color,
                                                         viewMatrix,
                                                         texture,
                                                         params,
-                                                        flags);
+                                                        flags,
+                                                        opaque);
 #endif
         }