Add AA Analytic Compile Flag (and small fixes)

src/core/SkScan.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkScan.h"
 #include "SkBlitter.h"
 #include "SkRasterClip.h"
 
-std::atomic<bool> gSkUseAnalyticAA{false};
+#ifdef SK_ANALYTIC_AA
+    std::atomic<bool> gSkUseAnalyticAA{true};
+#else
+    std::atomic<bool> gSkUseAnalyticAA{false};
+#endif
 
 static inline void blitrect(SkBlitter* blitter, const SkIRect& r) {
     blitter->blitRect(r.fLeft, r.fTop, r.width(), r.height());
 }
 
 void SkScan::FillIRect(const SkIRect& r, const SkRegion* clip,
                        SkBlitter* blitter) {
     if (!r.isEmpty()) {
         if (clip) {
             if (clip->isRect()) {
@@ skipping 77 matching lines @@
     }
 
     if (clip.isBW()) {
         FillRect(r, &clip.bwRgn(), blitter);
         return;
     }
 
     SkAAClipBlitterWrapper wrapper(clip, blitter);
     FillRect(r, &wrapper.getRgn(), wrapper.getBlitter());
 }