gfx: Use unsigned strides for gpu memory buffers.

gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h

Index: gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h
diff --git a/gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h b/gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h
index 0ad9e3fa80c1b99793f8a4b672638d192c5e27f2..ae64f9338fd1cbd35476a36941dbe6973db85005 100644
--- a/gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h
+++ b/gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h
@@ -54,7 +54,7 @@ class GPU_EXPORT GpuMemoryBufferImplSharedMemory : public GpuMemoryBufferImpl {
   bool Map() override;
   void* memory(size_t plane) override;
   void Unmap() override;
-  int stride(size_t plane) const override;
+  uint32_t stride(size_t plane) const override;
   gfx::GpuMemoryBufferHandle GetHandle() const override;
 
  private:
@@ -65,11 +65,11 @@ class GPU_EXPORT GpuMemoryBufferImplSharedMemory : public GpuMemoryBufferImpl {
       const DestructionCallback& callback,
       std::unique_ptr<base::SharedMemory> shared_memory,
       size_t offset,
-      int stride);
+      uint32_t stride);
 
   std::unique_ptr<base::SharedMemory> shared_memory_;
   size_t offset_;
-  int stride_;
+  uint32_t stride_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplSharedMemory);
 };