Reduce bug report compression level from 9 to 6.

This change reduces the zlib compression level for bug reports from 9 to
6, which will decrease deflation times at the cost of increasing
compressed bug report sizes.

Averaged over 5 back-to-back bug reports:
- Bug report deflation time decreased from 4.691s to 1.565s.
- Compressed bug report size increased from 12.82MiB to 14.60Mib.

Test: Build; check that bug reports are still taken correctly.
Bug: 215574756
Change-Id: Iedf2bf9f202ea6e0f7316c16da9abfdc14404701
diff --git a/cmds/dumpstate/dumpstate.cpp b/cmds/dumpstate/dumpstate.cpp
index 890c15f..ccb0359 100644
--- a/cmds/dumpstate/dumpstate.cpp
+++ b/cmds/dumpstate/dumpstate.cpp
@@ -829,7 +829,8 @@
 
     // Logging statement  below is useful to time how long each entry takes, but it's too verbose.
     // MYLOGD("Adding zip entry %s\n", entry_name.c_str());
-    int32_t err = zip_writer_->StartEntryWithTime(valid_name.c_str(), ZipWriter::kCompress,
+    size_t flags = ZipWriter::kCompress | ZipWriter::kDefaultCompression;
+    int32_t err = zip_writer_->StartEntryWithTime(valid_name.c_str(), flags,
                                                   get_mtime(fd, ds.now_));
     if (err != 0) {
         MYLOGE("zip_writer_->StartEntryWithTime(%s): %s\n", valid_name.c_str(),
@@ -921,7 +922,8 @@
 
 bool Dumpstate::AddTextZipEntry(const std::string& entry_name, const std::string& content) {
     MYLOGD("Adding zip text entry %s\n", entry_name.c_str());
-    int32_t err = zip_writer_->StartEntryWithTime(entry_name.c_str(), ZipWriter::kCompress, ds.now_);
+    size_t flags = ZipWriter::kCompress | ZipWriter::kDefaultCompression;
+    int32_t err = zip_writer_->StartEntryWithTime(entry_name.c_str(), flags, ds.now_);
     if (err != 0) {
         MYLOGE("zip_writer_->StartEntryWithTime(%s): %s\n", entry_name.c_str(),
                ZipWriter::ErrorCodeString(err));