Bug 1880373 - avoid failing browser_test_powerMetrics.js when a proce…

…ss CPU time is 0ms for both glean and ProcInfo, r=gerard-majax.

Depends on D201886

Differential Revision: https://phabricator.services.mozilla.com/D201888

UltraBlame original commit: 24fe25ac92b6a6d622370a94013931d5d60b7c90

toolkit/components/processtools/tests/browser/browser_test_powerMetrics.js

@@ -1367,19 +1367,15 @@ label
 )
 )
 {
-Assert
-.
-greaterOrEqual
+function
+getCpuTime
 (
-cpuTimeByType
-[
-label
-]
-Math
-.
-floor
+procInfo
+)
+{
+return
 (
-beforeProcInfo
+procInfo
 .
 children
 .
@@ -1400,6 +1396,125 @@ cpuTime
 /
 kNS_PER_MS
 )
+;
+}
+let
+beforeCpuTime
+=
+Math
+.
+floor
+(
+getCpuTime
+(
+beforeProcInfo
+)
+)
+;
+let
+afterCpuTime
+=
+Math
+.
+ceil
+(
+getCpuTime
+(
+afterProcInfo
+)
+)
+;
+let
+cpuTime
+=
+cpuTimeByType
+[
+label
+]
+;
+if
+(
+afterCpuTime
+=
+=
+0
+)
+{
+Assert
+.
+equal
+(
+cpuTime
+null
+"
+The
+"
++
+label
++
+"
+process
+used
+less
+than
+1ms
+of
+CPU
+time
+.
+"
+)
+;
+}
+else
+if
+(
+beforeCpuTime
+=
+=
+0
+&
+&
+cpuTime
+=
+=
+=
+null
+)
+{
+info
+(
+"
+The
+"
++
+label
++
+"
+process
+might
+have
+used
+used
+less
+than
+1ms
+of
+CPU
+time
+.
+"
+)
+;
+}
+else
+{
+Assert
+.
+greaterOrEqual
+(
+cpuTime
+beforeCpuTime
 "
 reported
 cpu
@@ -1428,35 +1543,8 @@ Assert
 .
 lessOrEqual
 (
-cpuTimeByType
-[
-label
-]
-Math
-.
-ceil
-(
-afterProcInfo
-.
-children
-.
-find
-(
-p
-=
->
-p
-.
-type
-=
-=
-label
-)
-.
 cpuTime
-/
-kNS_PER_MS
-)
+afterCpuTime
 "
 reported
 cpu
@@ -1482,6 +1570,7 @@ returned
 )
 ;
 }
+}
 else
 {
 info