gfx: Use unsigned strides for gpu memory buffers.

ui/gfx/native_pixmap_handle_ozone.h

Index: ui/gfx/native_pixmap_handle_ozone.h
diff --git a/ui/gfx/native_pixmap_handle_ozone.h b/ui/gfx/native_pixmap_handle_ozone.h
index ae80414b53b48f1eb78da4611c179e4858b8f789..932dd2656b291b977b90454ad5a403d9bd42519b 100644
--- a/ui/gfx/native_pixmap_handle_ozone.h
+++ b/ui/gfx/native_pixmap_handle_ozone.h
@@ -17,14 +17,14 @@ namespace gfx {
 // buffer. More fields can be added if they are plane specific.
 struct GFX_EXPORT NativePixmapPlane {
   NativePixmapPlane();
-  NativePixmapPlane(int stride, int offset, uint64_t modifier);
+  NativePixmapPlane(uint32_t stride, uint32_t offset, uint64_t modifier);
   NativePixmapPlane(const NativePixmapPlane& other);
   ~NativePixmapPlane();
 
   // The strides and offsets in bytes to be used when accessing the buffers via
   // a memory mapping. One per plane per entry.
-  int stride;
-  int offset;
+  uint32_t stride;
+  uint32_t offset;
   // The modifier is retrieved from GBM library and passed to EGL driver.
   // Generally it's platform specific, and we don't need to modify it in
   // Chromium code. Also one per plane per entry.