content: Depict priority in raster worker thread's name.

base/threading/platform_thread_posix.cc

Index: base/threading/platform_thread_posix.cc
diff --git a/base/threading/platform_thread_posix.cc b/base/threading/platform_thread_posix.cc
index bd6ae2dc09913b6396469455f16891dba90948a8..605f72696f4db683a384333230cab906e4f6298a 100644
--- a/base/threading/platform_thread_posix.cc
+++ b/base/threading/platform_thread_posix.cc
@@ -124,6 +124,23 @@ bool CreateThread(size_t stack_size,
 
 }  // namespace
 
+// TODO(prashant.n): Move to common file across platforms.
+std::string GetThreadPriorityAbbr(ThreadPriority priority) {
+  switch (priority) {
+    case ThreadPriority::BACKGROUND:
+      return "bg";
+    case ThreadPriority::NORMAL:
+      return "nl";
+    case ThreadPriority::DISPLAY:
+      return "ds";
+    case ThreadPriority::REALTIME_AUDIO:
+      return "rt";
+    default:
+      NOTREACHED();
+      return "";
+  }
+}
+
 // static
 PlatformThreadId PlatformThread::CurrentId() {
   // Pthreads doesn't have the concept of a thread ID, so we have to reach down