Break out isFramePending into its own feature

Ensure that when shipping isInputPending, we don't ship isFramePending as collateral.

Bug: 910421
Change-Id: Iddfc0ba927a9b61a90e99da18e12bb7513c93b27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443213
Commit-Queue: Andrew Comminos <acomminos@fb.com>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Auto-Submit: Andrew Comminos <acomminos@fb.com>
Cr-Commit-Position: refs/heads/master@{#812966}

third_party/blink/renderer/core/frame/scheduling.idl

@@ -7,6 +7,6 @@
     Exposed=Window,
     RuntimeEnabled=ExperimentalIsInputPending
 ] interface Scheduling {
-    [RuntimeEnabled=ExperimentalIsInputPending] boolean isFramePending();
+    [RuntimeEnabled=ExperimentalIsFramePending] boolean isFramePending();
     [CallWith=ScriptState, MeasureAs=SchedulingIsInputPending, RuntimeEnabled=ExperimentalIsInputPending] boolean isInputPending(optional IsInputPendingOptions options = {});
 };

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -751,10 +751,14 @@
       name: "ExperimentalContentSecurityPolicyFeatures",
       status: "experimental",
     },
-    // Enables navigator.scheduling.isInputPending and
-    // navigator.scheduling.isFramePending, allowing long-running JS to
-    // be able to yield itself when user input is queued (crbug.com/910421) or a
-    // display update is scheduled.
+    // Enables navigator.scheduling.isFramePending, allowing long-running JS to
+    // be able to yield itself when a display update is scheduled.
+    {
+      name: "ExperimentalIsFramePending",
+      status: "experimental"
+    },
+    // Enables navigator.scheduling.isInputPending, allowing long-running JS to
+    // be able to yield itself when user input is queued (crbug.com/910421).
     {
       name: "ExperimentalIsInputPending",
       origin_trial_feature_name: "ExperimentalIsInputPending",

third_party/blink/web_tests/http/tests/origin_trials/webexposed/isinputpending-origin-trial-interfaces.html

@@ -15,8 +15,8 @@ test(t => {
   OriginTrialsHelper.check_properties_exist(this,
       {
         'Navigator': ['scheduling'],
-        'Scheduling': ['isFramePending', 'isInputPending'],
+        'Scheduling': ['isInputPending'],
       },
   );
-}, "isFramePending/isInputPending related interfaces in Origin-Trial enabled document.");
+}, "isInputPending related interfaces in Origin-Trial enabled document.");
 </script>