Force enable OOP rasterization

Turns on out of process raster for the renderer whenever gpu raster
would have been used.  Enables the chromium_raster_transport extension.

This is being done because BaseMark Web 3.0 suffers and the switch
seems to be highly enabled by field trials in Chrome.

app/brave_main_delegate.cc

@@ -31,6 +31,7 @@
 #include "components/unified_consent/feature.h"
 #include "components/sync/driver/sync_driver_switches.h"
 #include "content/public/common/content_features.h"
+#include "content/public/common/content_switches.h"
 #include "extensions/common/extension_features.h"
 #include "services/network/public/cpp/features.h"
 #include "third_party/widevine/cdm/buildflags.h"
@@ -144,6 +145,10 @@ bool BraveMainDelegate::BasicStartupComplete(int* exit_code) {
       switches::kExtensionContentVerificationEnforceStrict);
   command_line.AppendSwitchASCII(switches::kExtensionsInstallVerification,
       "enforce");
+  // Otherwise BaseMark Web 3.0 suffers and it seems to be highly enabled
+  // by field trials in Chrome.
+  command_line.AppendSwitchASCII(switches::kEnableOopRasterization,
+      "Enabled");
 
   // Brave's sync protocol does not use the sync service url
   command_line.AppendSwitchASCII(switches::kSyncServiceURL,