adb: set thread names (linux & mac)

Bug: 23423333
Change-Id: I0069f32ddbae2a10fb130064f721facf45b2cc09
diff --git a/adb/usb_linux.cpp b/adb/usb_linux.cpp
index dd22712..6ccc8e2 100644
--- a/adb/usb_linux.cpp
+++ b/adb/usb_linux.cpp
@@ -572,6 +572,7 @@
 }
 
 static void* device_poll_thread(void* unused) {
+    adb_thread_setname("device poll");
     D("Created device thread\n");
     while (true) {
         // TODO: Use inotify.