[Chromecast] Support software rendering when disable-gpu used

ui/ozone/platform/cast/ozone_platform_cast.cc

Index: ui/ozone/platform/cast/ozone_platform_cast.cc
diff --git a/ui/ozone/platform/cast/ozone_platform_cast.cc b/ui/ozone/platform/cast/ozone_platform_cast.cc
index bd4053e9ae93765a4a5ab7c37bf41195e2f241cf..338fac226edf869234c7518e4a02d7299ed63705 100644
--- a/ui/ozone/platform/cast/ozone_platform_cast.cc
+++ b/ui/ozone/platform/cast/ozone_platform_cast.cc
@@ -80,6 +80,11 @@ class OzonePlatformCast : public OzonePlatform {
     cursor_factory_.reset(new CursorFactoryOzone());
     input_controller_ = CreateStubInputController();
     gpu_platform_support_host_.reset(CreateStubGpuPlatformSupportHost());
+
+    // Enable dummy software rendering support if GPU process disabled
+    // Note: switch is kDisableGpu from content/public/common/content_switches.h
+    if (base::CommandLine::ForCurrentProcess()->HasSwitch("disable-gpu"))
+      surface_factory_.reset(new SurfaceFactoryCast());
   }
   void InitializeGPU() override {
     surface_factory_.reset(new SurfaceFactoryCast(egl_platform_.Pass()));