Revert of removing GrDrawEffect (patchset #4 id:60001 of https://codereview.chromium.org/571163002/)

Reason for revert:
reverting to unblock another revert

Original issue's description:
> removing GrDrawEffect
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/8ddbe8b9366c8c59c4fb55f01f253de8a0b37d6e

R=bsalomon@google.com
TBR=bsalomon@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: joshualitt@chromium.org

Review URL: https://codereview.chromium.org/577593003
diff --git a/src/gpu/GrAAConvexPathRenderer.cpp b/src/gpu/GrAAConvexPathRenderer.cpp
index a479310..c6da45e 100644
--- a/src/gpu/GrAAConvexPathRenderer.cpp
+++ b/src/gpu/GrAAConvexPathRenderer.cpp
@@ -530,11 +530,11 @@
 
     class GLEffect : public GrGLGeometryProcessor {
     public:
-        GLEffect(const GrBackendEffectFactory& factory, const GrEffect&)
+        GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
             : INHERITED (factory) {}
 
         virtual void emitCode(GrGLFullProgramBuilder* builder,
-                              const GrEffect& effect,
+                              const GrDrawEffect& drawEffect,
                               const GrEffectKey& key,
                               const char* outputColor,
                               const char* inputColor,
@@ -569,14 +569,14 @@
             fsBuilder->codeAppendf("\t%s = %s;\n", outputColor,
                                    (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
 
-            const GrShaderVar& inQuadEdge = effect.cast<QuadEdgeEffect>().inQuadEdge();
+            const GrShaderVar& inQuadEdge = drawEffect.castEffect<QuadEdgeEffect>().inQuadEdge();
             GrGLVertexShaderBuilder* vsBuilder = builder->getVertexShaderBuilder();
             vsBuilder->codeAppendf("\t%s = %s;\n", vsName, inQuadEdge.c_str());
         }
 
-        static inline void GenKey(const GrEffect&, const GrGLCaps&, GrEffectKeyBuilder*) {}
+        static inline void GenKey(const GrDrawEffect&, const GrGLCaps&, GrEffectKeyBuilder*) {}
 
-        virtual void setData(const GrGLProgramDataManager&, const GrEffect&) SK_OVERRIDE {}
+        virtual void setData(const GrGLProgramDataManager&, const GrDrawEffect&) SK_OVERRIDE {}
 
     private:
         typedef GrGLGeometryProcessor INHERITED;