Do not lose secondary gpus and make sure to have an active gpu on multiple gpu configurations

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 98cf2e133e20088a7dd10d73039697dd1b8d4437..54af7b1c60201d5f14074a9f56da9d53996e1a6e 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -561,6 +561,12 @@ const char kGpuStartupDialog[]              = "gpu-startup-dialog";
 // Passes gpu vendor_id from browser process to GPU process.
 const char kGpuVendorID[]                   = "gpu-vendor-id";
 
+// Passes secondary gpu vendor ids from browser process to GPU process.
+const char kGpuSecondaryVendorIDs[] = "gpu-secondary-vendor-ids";
+
+// Passes secondary gpu device ids from browser process to GPU process.
+const char kGpuSecondaryDeviceIDs[] = "gpu-secondary-device-ids";
+
 // These mappings only apply to the host resolver.
 const char kHostResolverRules[]             = "host-resolver-rules";