gfx: Use unsigned strides for gpu memory buffers.

gpu/ipc/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc

 // Copyright 2014 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 "gpu/ipc/client/gpu_memory_buffer_impl_ozone_native_pixmap.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "gpu/ipc/common/gpu_memory_buffer_support.h"
@@ skipping 105 matching lines @@
 }
 
 void GpuMemoryBufferImplOzoneNativePixmap::Unmap() {
   DCHECK(mapped_);
   DCHECK(data_);
   pixmap_->Unmap();
   mapped_ = false;
   data_ = nullptr;
 }
 
-int GpuMemoryBufferImplOzoneNativePixmap::stride(size_t plane) const {
+uint32_t GpuMemoryBufferImplOzoneNativePixmap::stride(size_t plane) const {
   DCHECK_LT(plane, gfx::NumberOfPlanesForBufferFormat(format_));
-  int stride;
+  uint32_t stride;
   pixmap_->GetStride(&stride);
   return stride;
 }
 
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplOzoneNativePixmap::GetHandle()
     const {
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::OZONE_NATIVE_PIXMAP;
   handle.id = id_;
   handle.native_pixmap_handle.fds.emplace_back(fd_.get(),
                                                false /* auto_close */);
   handle.native_pixmap_handle.planes = planes_;
   return handle;
 }
 
 }  // namespace gpu