Hide fullscreen rotation jank

content/browser/renderer_host/compositor_impl_android.cc

Index: content/browser/renderer_host/compositor_impl_android.cc
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc
index 341cd87fb2349283373ad7fd94f3b0c2871a9b97..29abda01aa860df414c4d0a02782b1442e70bb82 100644
--- a/content/browser/renderer_host/compositor_impl_android.cc
+++ b/content/browser/renderer_host/compositor_impl_android.cc
@@ -59,6 +59,7 @@
 #include "content/common/gpu_stream_constants.h"
 #include "content/public/browser/android/compositor.h"
 #include "content/public/browser/android/compositor_client.h"
+#include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 #include "gpu/command_buffer/client/context_support.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
@@ -602,14 +603,18 @@ void CompositorImpl::SetHasTransparentBackground(bool transparent) {
   if (host_) {
     host_->set_has_transparent_background(transparent);
 
-    // Give a delay in setting the background color to avoid the color for
-    // the normal mode (white) affecting the UI transition.
-    base::ThreadTaskRunnerHandle::Get().get()->PostDelayedTask(
-        FROM_HERE,
-        base::Bind(&CompositorImpl::SetBackgroundColor,
-                   weak_factory_.GetWeakPtr(),
-                   transparent ? SK_ColorBLACK : SK_ColorWHITE),
-        base::TimeDelta::FromMilliseconds(500));
+    // TODO(steimel): Remove this feature flag and the hack inside this if block
+    // once we're confident that the fullscreen transition hiding is working
+    // properly.
+    if (!base::FeatureList::IsEnabled(
+            features::kHideFullscreenTransitionJank)) {
+      base::ThreadTaskRunnerHandle::Get().get()->PostDelayedTask(
+          FROM_HERE,
+          base::Bind(&CompositorImpl::SetBackgroundColor,
+                     weak_factory_.GetWeakPtr(),
+                     transparent ? SK_ColorBLACK : SK_ColorWHITE),
+          base::TimeDelta::FromMilliseconds(500));
+    }
   }
 }