Make GrPaint have a variable sized array of color and coverage stages rather than a fixed size.

src/gpu/GrAAConvexPathRenderer.cpp

Index: src/gpu/GrAAConvexPathRenderer.cpp
diff --git a/src/gpu/GrAAConvexPathRenderer.cpp b/src/gpu/GrAAConvexPathRenderer.cpp
index 5d461ab3ed5fef6c65e8f8447c01de38ba998de1..408fcb541f9232d9d37e5262e33d344624688907 100644
--- a/src/gpu/GrAAConvexPathRenderer.cpp
+++ b/src/gpu/GrAAConvexPathRenderer.cpp
@@ -637,12 +637,6 @@ bool GrAAConvexPathRenderer::onDrawPath(const SkPath& origPath,
 
     drawState->setVertexAttribs<gPathAttribs>(SK_ARRAY_COUNT(gPathAttribs));
 
-    enum {
-        // the edge effects share this stage with glyph rendering
-        // (kGlyphMaskStage in GrTextContext) && SW path rendering
-        // (kPathMaskStage in GrSWMaskHelper)
-        kEdgeEffectStage = GrPaint::kTotalStages,
-    };
     static const int kEdgeAttrIndex = 1;
     GrEffectRef* quadEffect = QuadEdgeEffect::Create();
     drawState->addCoverageEffect(quadEffect, kEdgeAttrIndex)->unref();