cc: Handle overflow/underflow in MathUtil::RoundUp/RoundDown functions.

cc/resources/video_resource_updater.cc

Index: cc/resources/video_resource_updater.cc
diff --git a/cc/resources/video_resource_updater.cc b/cc/resources/video_resource_updater.cc
index 88e8360f0b7392b4644a0e4ebb8aef3bec6514db..e5a6c5f01c7987adca04b8aafcb0a8cd92056964 100644
--- a/cc/resources/video_resource_updater.cc
+++ b/cc/resources/video_resource_updater.cc
@@ -311,7 +311,8 @@ VideoFrameExternalResources VideoResourceUpdater::CreateForSoftwarePlanes(
           resource_size_pixels.width(), plane_resource.resource_format);
       // Use 4-byte row alignment (OpenGL default) for upload performance.
       // Assuming that GL_UNPACK_ALIGNMENT has not changed from default.
-      size_t upload_image_stride = MathUtil::RoundUp<size_t>(bytes_per_row, 4u);
+      size_t upload_image_stride =
+          MathUtil::UncheckedRoundUp<size_t>(bytes_per_row, 4u);
 
       const uint8_t* pixels;
       size_t video_bytes_per_row = ResourceUtil::UncheckedWidthInBytes<size_t>(