Add explicit Exposed in performance APIs

This CL makes the code align with making Exposed mandatory for interfaces.
See the following for more details:
https://github.com/web-platform-tests/wpt/pull/18382
https://github.com/heycam/webidl/pull/423

Change-Id: I293e80cd0d953f2f47480f838eecd5f588ec6d80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768918Reviewed-by: Luke Bj <lukebjerring@chromium.org>
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689988}

third_party/blink/renderer/core/timing/memory_info.idl

@@ -32,7 +32,7 @@
 // https://groups.google.com/a/chromium.org/d/msg/blink-dev/g5YRCGpC9vs/b4OJz71NmPwJ
 
 [
-    NoInterfaceObject
+    Exposed=Window, NoInterfaceObject
 ] interface MemoryInfo {
     [Measure] readonly attribute unsigned long long totalJSHeapSize;
     [Measure] readonly attribute unsigned long long usedJSHeapSize;

third_party/blink/renderer/core/timing/performance_element_timing.idl

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 // https://wicg.github.io/element-timing/#sec-performance-element-timing
-[RuntimeEnabled=ElementTiming]
+[Exposed=Window, RuntimeEnabled=ElementTiming]
 interface PerformanceElementTiming : PerformanceEntry {
     readonly attribute DOMHighResTimeStamp renderTime;
     readonly attribute DOMHighResTimeStamp loadTime;

third_party/blink/renderer/core/timing/performance_long_task_timing.idl

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 // https://w3c.github.io/longtasks/#sec-PerformanceLongTaskTiming
+[Exposed=Window]
 interface PerformanceLongTaskTiming : PerformanceEntry {
     [SameObject, SaveSameObject] readonly attribute FrozenArray<TaskAttributionTiming> attribution;
 

third_party/blink/renderer/core/timing/performance_paint_timing.idl

@@ -4,5 +4,6 @@
 
 // https://w3c.github.io/paint-timing/#sec-PerformancePaintTiming
 
+[Exposed=Window]
 interface PerformancePaintTiming : PerformanceEntry {
 };

third_party/blink/renderer/core/timing/task_attribution_timing.idl

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 // https://w3c.github.io/longtasks/#sec-TaskAttributionTiming
+[Exposed=Window]
 interface TaskAttributionTiming : PerformanceEntry {
     [RuntimeEnabled=LongTaskV2] readonly attribute DOMString scriptURL;
     readonly attribute DOMString containerType;