Bug 1616364 - initailize thread profiler on Compositor thread only once r=gw

[import_pr] From servo/webrender#3864

Differential Revision: https://phabricator.services.mozilla.com/D63242

UltraBlame original commit: e106dc52d496cbcadece6b6dcab57071ac815644

Author: marco-c

gfx/wr/webrender/src/renderer.rs

@@ -11418,6 +11418,24 @@ RenderApiSender
 RendererError
 >
 {
+if
+!
+wr_has_been_initialized
+(
+)
+{
+register_thread_with_profiler
+(
+"
+Compositor
+"
+.
+to_owned
+(
+)
+)
+;
+}
 HAS_BEEN_INITIALIZED
 .
 store
@@ -11835,17 +11853,6 @@ max_texture_layers
 (
 )
 ;
-register_thread_with_profiler
-(
-"
-Compositor
-"
-.
-to_owned
-(
-)
-)
-;
 device
 .
 begin_frame