Add flag to disable impl-side painting

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index e5cb16531835bd785635d43139e9212f6e54e2f5..3db726a1343b0819d9a4d2fc214a916ce8de7e45 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -851,6 +851,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kWebCoreLogChannels,
     cc::switches::kBackgroundColorInsteadOfCheckerboard,
     cc::switches::kEnableCompositorFrameMessage,
+    cc::switches::kDisableImplSidePainting,
     cc::switches::kEnableImplSidePainting,
     cc::switches::kEnablePartialSwap,
     cc::switches::kEnableRightAlignedScheduling,
@@ -882,7 +883,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
   }
 
   // Enforce the extra command line flags for impl-side painting.
-  if (browser_cmd.HasSwitch(cc::switches::kEnableImplSidePainting) &&
+  if (cc::switches::IsImplSidePaintingEnabled() &&
       !browser_cmd.HasSwitch(switches::kEnableDeferredImageDecoding))
     renderer_cmd->AppendSwitch(switches::kEnableDeferredImageDecoding);
 }