Revert "[perfcombined2024] Enable EstablishGpuChannelAsync and EarlyEstablishGpuChannel by default."

This reverts commit 897fab96d7.

Reason for revert: b/394866598#comment35

Original change's description:
> [perfcombined2024] Enable EstablishGpuChannelAsync and EarlyEstablishGpuChannel by default.
>
> Please revert if HeadlessBrowserTest.WebGLSupported starts failing.
> (the test failed 2 times in CQ dry run for this CL, but no longer
> fails, so we aren't sure if it's related, but if it starts failing on
> the waterfall this CL may be the cause)
>
> go/perf-combined-2024-summary
>
> Bug: 40287434
> Change-Id: Ia057dea67dbaeba5240694c483e032fd29b09f34
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6094045
> Reviewed-by: Olivier Li <olivierli@chromium.org>
> Commit-Queue: Francois Pierre Doray <fdoray@chromium.org>
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Auto-Submit: Francois Pierre Doray <fdoray@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1410886}

Bug: 40287434
Change-Id: I32e1aeba9120eb717f5953f336997c4117a3a138
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6383821
Commit-Queue: Francois Pierre Doray <fdoray@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1436473}

content/public/common/content_features.cc

@@ -385,7 +385,7 @@ BASE_FEATURE(kDrawCutoutEdgeToEdge,
 // Enable establishing the GPU channel early in renderer startup.
 BASE_FEATURE(kEarlyEstablishGpuChannel,
              "EarlyEstablishGpuChannel",
-             base::FEATURE_ENABLED_BY_DEFAULT);
+             base::FEATURE_DISABLED_BY_DEFAULT);
 
 // Enables canvas 2d methods BeginLayer and EndLayer.
 BASE_FEATURE(kEnableCanvas2DLayers,

testing/variations/fieldtrial_testing_config.json

@@ -8708,6 +8708,22 @@
             ]
         }
     ],
+    "EarlyEstablishGpuChannelAndroid": [
+        {
+            "platforms": [
+                "android",
+                "android_webview"
+            ],
+            "experiments": [
+                {
+                    "name": "EarlyEstablishGpuChannel",
+                    "enable_features": [
+                        "EarlyEstablishGpuChannel"
+                    ]
+                }
+            ]
+        }
+    ],
     "EdgeToEdgeAndroid": [
         {
             "platforms": [
@@ -16996,6 +17012,8 @@
                 {
                     "name": "Enabled",
                     "enable_features": [
+                        "EarlyEstablishGpuChannel",
+                        "EstablishGpuChannelAsync",
                         "ExpandedPrefetchRange",
                         "FledgeEnableWALForInterestGroupStorage",
                         "MojoBindingsInlineSLS",
@@ -17013,6 +17031,8 @@
                 {
                     "name": "Enabled",
                     "enable_features": [
+                        "EarlyEstablishGpuChannel",
+                        "EstablishGpuChannelAsync",
                         "FledgeEnableWALForInterestGroupStorage",
                         "MojoBindingsInlineSLS",
                         "NumberOfCoresWithCpuSecurityMitigation",
@@ -17032,6 +17052,8 @@
                 {
                     "name": "Enabled",
                     "enable_features": [
+                        "EarlyEstablishGpuChannel",
+                        "EstablishGpuChannelAsync",
                         "FledgeEnableWALForInterestGroupStorage",
                         "MojoBindingsInlineSLS",
                         "ReduceCpuUtilization2",

third_party/blink/common/features.cc

@@ -726,7 +726,14 @@ BASE_FEATURE(kDropInputEventsWhilePaintHolding,
 
 BASE_FEATURE(kEstablishGpuChannelAsync,
              "EstablishGpuChannelAsync",
-             base::FEATURE_ENABLED_BY_DEFAULT);
+#if BUILDFLAG(IS_ANDROID)
+             base::FEATURE_ENABLED_BY_DEFAULT
+#else
+             // TODO(crbug.com/1278147): Experiment with this more on desktop to
+             // see if it can help.
+             base::FEATURE_DISABLED_BY_DEFAULT
+#endif
+);
 
 // Whether to respect loading=lazy attribute for images when they are on
 // invisible pages.