gfx: Use unsigned strides for gpu memory buffers.

ui/ozone/platform/cast/client_native_pixmap_factory_cast.cc

Index: ui/ozone/platform/cast/client_native_pixmap_factory_cast.cc
diff --git a/ui/ozone/platform/cast/client_native_pixmap_factory_cast.cc b/ui/ozone/platform/cast/client_native_pixmap_factory_cast.cc
index 9c1cf2926ecad4075e82b595d7e764e2fed2d8c4..0bc911969d8e6c6e5d664e8255068bbd8c9f1d78 100644
--- a/ui/ozone/platform/cast/client_native_pixmap_factory_cast.cc
+++ b/ui/ozone/platform/cast/client_native_pixmap_factory_cast.cc
@@ -24,7 +24,7 @@ class ClientNativePixmapCast : public ClientNativePixmap {
     return nullptr;
   }
   void Unmap() override { NOTREACHED(); }
-  void GetStride(int* stride) const override { NOTREACHED(); }
+  void GetStride(uint32_t* stride) const override { NOTREACHED(); }
 };
 
 class ClientNativePixmapFactoryCast : public ClientNativePixmapFactory {