Add installd support to dex2oat

Change-Id: Id1a64403ccea7dc2c1e8b8340d33d383d4045a33
diff --git a/src/oat_file.cc b/src/oat_file.cc
index c37c7a6..58dd984 100644
--- a/src/oat_file.cc
+++ b/src/oat_file.cc
@@ -12,8 +12,8 @@
 
 std::string OatFile::DexFilenameToOatFilename(const std::string& location) {
   CHECK(IsValidDexFilename(location) || IsValidZipFilename(location));
-  std::string oat_location(location.substr(0, location.size() - 3));
-  oat_location += "oat";
+  std::string oat_location(location);
+  oat_location += ".oat";
   return oat_location;
 }