Enable NV12 DXGI video copying path by default.

content/public/browser/gpu_utils.cc

Index: content/public/browser/gpu_utils.cc
diff --git a/content/public/browser/gpu_utils.cc b/content/public/browser/gpu_utils.cc
index 0a14a3d26b59ef4a34a665515ca303d7e67676b5..69acbbff2bc239b929a519e7d338541de25a6cf8 100644
--- a/content/public/browser/gpu_utils.cc
+++ b/content/public/browser/gpu_utils.cc
@@ -53,7 +53,7 @@ const gpu::GpuPreferences GetGpuPreferencesFromCommandLine() {
   gpu_preferences.enable_zero_copy_dxgi_video =
       command_line->HasSwitch(switches::kEnableZeroCopyDxgiVideo);
   gpu_preferences.enable_nv12_dxgi_video =
-      command_line->HasSwitch(switches::kEnableNv12DxgiVideo);
+      !command_line->HasSwitch(switches::kDisableNv12DxgiVideo);
 #endif
   gpu_preferences.compile_shader_always_succeeds =
       command_line->HasSwitch(switches::kCompileShaderAlwaysSucceeds);