gfx: Use unsigned strides for gpu memory buffers.

ui/ozone/platform/drm/client_native_pixmap_factory_gbm.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/client_native_pixmap_factory_gbm.h"
 
 #include <utility>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "ui/gfx/native_pixmap_handle_ozone.h"
 #include "ui/ozone/platform/drm/common/client_native_pixmap_dmabuf.h"
 #include "ui/ozone/public/client_native_pixmap_factory.h"
 
 namespace ui {
 
 namespace {
 
 class ClientNativePixmapGbm : public ClientNativePixmap {
  public:
   ClientNativePixmapGbm() {}
   ~ClientNativePixmapGbm() override {}
 
   void* Map() override {
     NOTREACHED();
     return nullptr;
   }
   void Unmap() override { NOTREACHED(); }
-  void GetStride(int* stride) const override { NOTREACHED(); }
+  void GetStride(uint32_t* stride) const override { NOTREACHED(); }
 };
 
 }  // namespace
 
 class ClientNativePixmapFactoryGbm : public ClientNativePixmapFactory {
  public:
   ClientNativePixmapFactoryGbm() {}
   ~ClientNativePixmapFactoryGbm() override {}
 
   // ClientNativePixmapFactory:
@@ skipping 55 matching lines @@
   }
 
   DISALLOW_COPY_AND_ASSIGN(ClientNativePixmapFactoryGbm);
 };
 
 ClientNativePixmapFactory* CreateClientNativePixmapFactoryGbm() {
   return new ClientNativePixmapFactoryGbm();
 }
 
 }  // namespace ui