Reduce VABC memory usage

BlockExtentWriter caches data in memory up until get gets a complete
extent. For full OTAs, extents are chopped to 2MB chunks. But for
incremental OTAs, extents can be as large as single file size. We have
observed a single extent to span >100MB disk space on pixel. This incurs
significant memory overhead depending on layout of file system image.
To reduce VABC memory usage, bound memory cache by 1MB

Test: th
Bug: 279305177
Change-Id: I75dbdd60f7e9939fc0fcabe7510fc7ff800087be
diff --git a/payload_consumer/bzip_extent_writer.cc b/payload_consumer/bzip_extent_writer.cc
index 9491964..bee9fcd 100644
--- a/payload_consumer/bzip_extent_writer.cc
+++ b/payload_consumer/bzip_extent_writer.cc
@@ -14,6 +14,7 @@
 // limitations under the License.
 //
 
+#include "update_engine/common/utils.h"
 #include "update_engine/payload_consumer/bzip_extent_writer.h"
 
 using google::protobuf::RepeatedPtrField;