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..dc6b9168369167e1b13bafc94d81530b5156f585 100644
--- a/cc/resources/memory_history.h
+++ b/cc/resources/memory_history.h
@@ -24,14 +24,14 @@ 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;
+    bool had_enough_memory;
     size_t bytes_total() const {
-      return bytes_allocated + bytes_unreleasable + bytes_over;
+      return bytes_allocated + bytes_unreleasable;
     }
   };