Change Atlas recycling to track current flush count and recycle if Atlas not used in current flush.

src/gpu/GrTextStrike.h

Index: src/gpu/GrTextStrike.h
diff --git a/src/gpu/GrTextStrike.h b/src/gpu/GrTextStrike.h
index e359e267cf9816877a1db4d52011a4dc5b59efeb..c57cdc6c2da60194ccc5e3695963289c8f2c858b 100644
--- a/src/gpu/GrTextStrike.h
+++ b/src/gpu/GrTextStrike.h
@@ -37,7 +37,7 @@ public:
     GrMaskFormat getMaskFormat() const { return fMaskFormat; }
 
     inline GrGlyph* getGlyph(GrGlyph::PackedID, GrFontScaler*);
-    bool getGlyphAtlas(GrGlyph*, GrFontScaler*);
+    bool getGlyphAtlas(GrGlyph*, GrFontScaler*, uint64_t currentFlushCount);
 
     // testing
     int countGlyphs() const { return fCache.getArray().count(); }
@@ -47,7 +47,7 @@ public:
     GrAtlas* getAtlas() const { return fAtlas; }
 
     // returns true if an atlas was removed
-    bool removeUnusedAtlases();
+    bool removeUnusedAtlases(uint64_t currentFlushCount);
 
 public:
     // for LRU
@@ -85,7 +85,7 @@ public:
     void purgeExceptFor(GrTextStrike*);
 
     // remove an unused atlas and its strike (if necessary)
-    void freeAtlasExceptFor(GrTextStrike*);
+    void freeAtlasExceptFor(GrTextStrike*, uint64_t currentFlushCount);
 
     // testing
     int countStrikes() const { return fCache.getArray().count(); }