cc: Start using raster/eviction iterators in tile manager

cc/resources/memory_history.h

Index: cc/resources/memory_history.h
diff --git a/cc/resources/memory_history.h b/cc/resources/memory_history.h
index daca10f35a0a7a665e1de8ac41be05f88bfd5922..0b8ca38b541df0e01f2de6d4830c51874fc25b53 100644
--- a/cc/resources/memory_history.h
+++ b/cc/resources/memory_history.h
@@ -24,15 +24,13 @@ class MemoryHistory {
         : total_budget_in_bytes(0),
           bytes_allocated(0),
           bytes_unreleasable(0),
-          bytes_over(0) {}
+          had_enough_memory(false) {}
 
     size_t total_budget_in_bytes;
     size_t bytes_allocated;
     size_t bytes_unreleasable;
-    size_t bytes_over;
-    size_t bytes_total() const {
-      return bytes_allocated + bytes_unreleasable + bytes_over;
-    }
+    bool had_enough_memory;
+    size_t bytes_total() const { return bytes_allocated + bytes_unreleasable; }
   };
 
   void SaveEntry(const Entry& entry);