Only recycle and evict textures not in-use on the impl thread.

cc/CCPrioritizedTextureManager.h

Index: cc/CCPrioritizedTextureManager.h
diff --git a/cc/CCPrioritizedTextureManager.h b/cc/CCPrioritizedTextureManager.h
index 88a4f45fcfb176186078e1ce0db5b425e4daf285..84a47584888a0e6d77da4a0c753c4f698caf8139 100644
--- a/cc/CCPrioritizedTextureManager.h
+++ b/cc/CCPrioritizedTextureManager.h
@@ -76,6 +76,8 @@ public:
     void unregisterTexture(CCPrioritizedTexture*);
     void returnBackingTexture(CCPrioritizedTexture*);
 
+    void updateBackingsPriorities();
+
 private:
     friend class CCPrioritizedTextureTest;
 
@@ -109,7 +111,6 @@ private:
 
     CCPrioritizedTextureManager(size_t maxMemoryLimitBytes, int maxTextureSize, int pool);
 
-    void updateBackingsPriorities();
     void evictBackingsToReduceMemory(size_t limitBytes, EvictionPriorityPolicy, CCResourceProvider*);
     CCPrioritizedTexture::Backing* createBacking(IntSize, GC3Denum format, CCResourceProvider*);
     void evictBackingResource(CCPrioritizedTexture::Backing*, CCResourceProvider*);