Bug 1462784 - Add an IDLE category. r=njn

MozReview-Commit-ID: JJ30AhXofBr

--HG--
extra : rebase_source : 17892aee7f637d2e4854173bef26c591c62ad21e

js/public/ProfilingStack.h

@@ -190,6 +190,7 @@ class ProfilingStackFrame
 
     // Keep these in sync with devtools/client/performance/modules/categories.js
     enum class Category : uint32_t {
+        IDLE,
         OTHER,
         LAYOUT,
         JS,

widget/android/nsAppShell.cpp

@@ -726,7 +726,7 @@ nsAppShell::ProcessNextNativeEvent(bool mayWait)
             }
 
             AUTO_PROFILER_LABEL("nsAppShell::ProcessNextNativeEvent:Wait",
-                                OTHER);
+                                IDLE);
             mozilla::HangMonitor::Suspend();
 
             curEvent = mEventQueue.Pop(/* mayWait */ true);