Revert of [Temporary On Will revert on Fri] UI impl side painting default on

ui/compositor/compositor_switches.cc

Index: ui/compositor/compositor_switches.cc
diff --git a/ui/compositor/compositor_switches.cc b/ui/compositor/compositor_switches.cc
index f003e9d499be90b544e76275fc6f658bccd3c307..7b8fed3ca9890f634a8b89575913a91cd21a18ab 100644
--- a/ui/compositor/compositor_switches.cc
+++ b/ui/compositor/compositor_switches.cc
@@ -20,7 +20,7 @@
 const char kUIEnableCompositorAnimationTimelines[] =
     "ui-enable-compositor-animation-timelines";
 
-const char kUIDisableImplSidePainting[] = "ui-disable-impl-side-painting";
+const char kUIEnableImplSidePainting[] = "ui-enable-impl-side-painting";
 
 const char kUIEnableSlimmingPaint[] = "ui-enable-slimming-paint";
 
@@ -35,8 +35,7 @@
 bool IsUIImplSidePaintingEnabled() {
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
-
-  return !command_line.HasSwitch(switches::kUIDisableImplSidePainting);
+  return command_line.HasSwitch(switches::kUIEnableImplSidePainting);
 }
 
 bool IsUIZeroCopyEnabled() {