gfx: Use unsigned strides for gpu memory buffers.

content/browser/renderer_host/media/video_capture_buffer_pool_unittest.cc

 // Copyright (c) 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.
 
 // Unit test for VideoCaptureBufferPool.
 
 #include "content/browser/renderer_host/media/video_capture_buffer_pool.h"
 
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 61 matching lines @@
       return static_cast<void*>(data_);
     }
     void Unmap() override {
       EXPECT_TRUE(mapped_);
       mapped_ = false;
     }
     gfx::Size GetSize() const override { return size_; }
     gfx::BufferFormat GetFormat() const override {
       return gfx::BufferFormat::BGRA_8888;
     }
-    int stride(size_t plane) const override {
+    uint32_t stride(size_t plane) const override {
       EXPECT_EQ(0u, plane);
       return size_.width() * 4;
     }
     gfx::GpuMemoryBufferId GetId() const override {
       return gfx::GpuMemoryBufferId(0);
     }
     gfx::GpuMemoryBufferHandle GetHandle() const override {
       return gfx::GpuMemoryBufferHandle();
     }
     ClientBuffer AsClientBuffer() override { return nullptr; }
@@ skipping 402 matching lines @@
   ASSERT_NE(nullptr, held_buffers.back().get());
   resurrected = ResurrectLastBuffer(gfx::Size(10, 10), GetParam());
   ASSERT_EQ(nullptr, resurrected.get());
 }
 
 INSTANTIATE_TEST_CASE_P(,
                         VideoCaptureBufferPoolTest,
                         testing::ValuesIn(kCapturePixelFormatAndStorages));
 
 } // namespace content