gfx: Use unsigned strides for gpu memory buffers.

media/renderers/mock_gpu_video_accelerator_factories.cc

 // Copyright 2013 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 "media/renderers/mock_gpu_video_accelerator_factories.h"
 
 #include "base/memory/ptr_util.h"
 #include "ui/gfx/buffer_format_util.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
@@ skipping 34 matching lines @@
     return &bytes_[plane][0];
   }
   void Unmap() override {
     DCHECK(mapped_);
     mapped_ = false;
   }
   gfx::Size GetSize() const override { return size_; }
   gfx::BufferFormat GetFormat() const override {
     return format_;
   }
-  int stride(size_t plane) const override {
+  uint32_t stride(size_t plane) const override {
     DCHECK_LT(plane, num_planes_);
-    return static_cast<int>(gfx::RowSizeForBufferFormat(
+    return static_cast<uint32_t>(gfx::RowSizeForBufferFormat(
         size_.width(), format_, static_cast<int>(plane)));
   }
   gfx::GpuMemoryBufferId GetId() const override { return id_; }
   gfx::GpuMemoryBufferHandle GetHandle() const override {
     NOTREACHED();
     return gfx::GpuMemoryBufferHandle();
   }
   ClientBuffer AsClientBuffer() override {
     return reinterpret_cast<ClientBuffer>(this);
   }
@@ skipping 74 matching lines @@
 };
 }  // namespace
 
 std::unique_ptr<GpuVideoAcceleratorFactories::ScopedGLContextLock>
 MockGpuVideoAcceleratorFactories::GetGLContextLock() {
   DCHECK(gles2_);
   return base::MakeUnique<ScopedGLContextLockImpl>(this);
 }
 
 }  // namespace media