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 4337ff43751d60d4fe32c4e88b000dc97deda782..0b2455c50dbbc23ab79bd030ea6c95f87dcefd84 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -849,6 +849,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kWebCoreLogChannels,
     cc::switches::kBackgroundColorInsteadOfCheckerboard,
     cc::switches::kEnableCompositorFrameMessage,
+    cc::switches::kDisableImplSidePainting,
     cc::switches::kEnableImplSidePainting,
     cc::switches::kEnablePartialSwap,
     cc::switches::kEnableRightAlignedScheduling,
@@ -879,7 +880,7 @@ 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);
 }