Remove JankTrackingSweepLine base::Feature.

Bug: 1000716
Change-Id: I25013ba77c03a05357f787c4ecec540d0e54ddd1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787348Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Steve Kobes <skobes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693821}

content/child/runtime_features.cc

@@ -486,12 +486,6 @@ void SetIndividualRuntimeFeatures(
   WebRuntimeFeatures::EnableFractionalScrollOffsets(
       base::FeatureList::IsEnabled(features::kFractionalScrollOffsets));
 
-  // TODO(yashard): Remove |enable_experimental_web_platform_features| flag
-  // since the feature should have been enabled when it is set to experimental
-  WebRuntimeFeatures::EnableJankTrackingSweepLine(
-      base::FeatureList::IsEnabled(blink::features::kJankTrackingSweepLine) ||
-      enable_experimental_web_platform_features);
-
   WebRuntimeFeatures::EnableFirstContentfulPaintPlusPlus(
       base::FeatureList::IsEnabled(
           blink::features::kFirstContentfulPaintPlusPlus));

testing/variations/fieldtrial_testing_config.json

@@ -3038,25 +3038,6 @@
             ]
         }
     ],
-    "JankTrackingSweepLine": [
-        {
-            "platforms": [
-                "android",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "JankTrackingSweepLine"
-                    ]
-                }
-            ]
-        }
-    ],
     "KeyboardAccessoryAddressIPH": [
         {
             "platforms": [

third_party/blink/common/features.cc

@@ -58,11 +58,6 @@ const base::Feature kFreezePurgeMemoryAllPagesFrozen{
 const base::Feature kFreezeUserAgent{"FreezeUserAgent",
                                      base::FEATURE_DISABLED_BY_DEFAULT};
 
-// Enables the experimental sweep-line algorithm for tracking "jank" from
-// layout objects changing their visual location between animation frames.
-const base::Feature kJankTrackingSweepLine{"JankTrackingSweepLine",
-                                           base::FEATURE_DISABLED_BY_DEFAULT};
-
 // Enable a new CSS property called backdrop-filter.
 const base::Feature kCSSBackdropFilter {
   "CSSBackdropFilter",

third_party/blink/public/common/features.h

@@ -29,7 +29,6 @@ BLINK_COMMON_EXPORT extern const base::Feature kFirstContentfulPaintPlusPlus;
 BLINK_COMMON_EXPORT extern const base::Feature kFreezePurgeMemoryAllPagesFrozen;
 BLINK_COMMON_EXPORT extern const base::Feature kFreezeUserAgent;
 BLINK_COMMON_EXPORT extern const base::Feature kImplicitRootScroller;
-BLINK_COMMON_EXPORT extern const base::Feature kJankTrackingSweepLine;
 BLINK_COMMON_EXPORT extern const base::Feature kCSSBackdropFilter;
 BLINK_COMMON_EXPORT extern const base::Feature kDisplayLocking;
 BLINK_COMMON_EXPORT extern const base::Feature kFastBorderRadius;