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

src/gpu/GrDrawTarget.h

Index: src/gpu/GrDrawTarget.h
diff --git a/src/gpu/GrDrawTarget.h b/src/gpu/GrDrawTarget.h
index 0c2b568da418450eee64c6e6731207799d0383e2..9501d96301bf015f545dce56db3d8dbec215c5c5 100644
--- a/src/gpu/GrDrawTarget.h
+++ b/src/gpu/GrDrawTarget.h
@@ -621,6 +621,23 @@ public:
         GrDrawTarget*    fTarget;
     };
 
+    ///////////////////////////////////////////////////////////////////////////
+    // Draw execution tracking (for font atlases and other resources)
+    class DrawToken {
+    public:
+        DrawToken(GrDrawTarget* drawTarget, uint32_t drawID) :
+                  fDrawTarget(drawTarget), fDrawID(drawID) {}
+        
+        bool isIssued() { return NULL != fDrawTarget && fDrawTarget->isIssued(fDrawID); }
+        
+    private:
+        GrDrawTarget*  fDrawTarget;
+        uint32_t       fDrawID;   // this may wrap, but we're doing direct comparison
+                                  // so that should be okay
+    };
+    
+    virtual DrawToken getCurrentDrawToken() { return DrawToken(this, 0); }
+        
 protected:
 
     enum GeometrySrcType {
@@ -839,6 +856,9 @@ private:
     // but couldn't be made. Otherwise, returns true.
     bool setupDstReadIfNecessary(DrawInfo* info);
 
+    // Check to see if this set of draw commands has been sent out
+    virtual bool       isIssued(uint32_t drawID) { return true; }
+    
     enum {
         kPreallocGeoSrcStateStackCnt = 4,
     };