Add support for the Android-specific DEBUG and VERBOSE log levels.

(But these are currently always-on, like all other log levels at the moment.)

Change-Id: Ie2cc66eb4b1ba2f11c0bd13bfe32da94d5b168f8
diff --git a/src/logging_linux.cc b/src/logging_linux.cc
index d62649b..42bc50b 100644
--- a/src/logging_linux.cc
+++ b/src/logging_linux.cc
@@ -28,14 +28,14 @@
 namespace art {
 
 LogMessage::LogMessage(const char* file, int line, LogSeverity severity, int error)
-: line_number_(line), severity_(severity), errno_(error)
-{
+    : line_number_(line), severity_(severity), errno_(error) {
   const char* last_slash = strrchr(file, '/');
   file_ = (last_slash == NULL) ? file : last_slash + 1;
 }
 
 void LogMessage::LogLine(const char* line) {
-  std::cerr << "IWEF"[severity_] << ' ' << StringPrintf("%5d %5d", getpid(), ::art::GetTid()) << ' '
+  std::cerr << "VDIWEF"[severity_] << ' '
+            << StringPrintf("%5d %5d", getpid(), ::art::GetTid()) << ' '
             << file_ << ':' << line_number_ << "] " << line << std::endl;
 }