Bug 1204168 - Add the js::ProfileEntry::setCategory method; r=djvj

js/public/ProfilingStack.h

@@ -126,9 +126,14 @@ class ProfileEntry
     uint32_t flags() const volatile {
         return flags_;
     }
+
     uint32_t category() const volatile {
         return flags_ & CATEGORY_MASK;
     }
+    void setCategory(Category category) volatile {
+        flags_ &= ~CATEGORY_MASK;
+        setFlag(static_cast<uint32_t>(category));
+    }
 
     void setOSR() volatile {
         MOZ_ASSERT(isJs());