gfx: Use unsigned strides for gpu memory buffers.

gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc

Index: gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc
diff --git a/gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc b/gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc
index e867917160d6e696aee714fa0c85b7309decee80..897bd6c278f7140b64337ac4e66c9f42f92b4ea5 100644
--- a/gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc
+++ b/gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc
@@ -28,7 +28,7 @@ GpuMemoryBufferImplSharedMemory::GpuMemoryBufferImplSharedMemory(
     const DestructionCallback& callback,
     std::unique_ptr<base::SharedMemory> shared_memory,
     size_t offset,
-    int stride)
+    uint32_t stride)
     : GpuMemoryBufferImpl(id, size, format, callback),
       shared_memory_(std::move(shared_memory)),
       offset_(offset),
@@ -76,7 +76,7 @@ GpuMemoryBufferImplSharedMemory::AllocateForChildProcess(
   handle.type = gfx::SHARED_MEMORY_BUFFER;
   handle.id = id;
   handle.offset = 0;
-  handle.stride = static_cast<int32_t>(
+  handle.stride = static_cast<uint32_t>(
       gfx::RowSizeForBufferFormat(size.width(), format, 0));
   shared_memory.GiveToProcess(child_process, &handle.handle);
   return handle;
@@ -170,7 +170,7 @@ base::Closure GpuMemoryBufferImplSharedMemory::AllocateForTesting(
   DCHECK(rv);
   handle->type = gfx::SHARED_MEMORY_BUFFER;
   handle->offset = 0;
-  handle->stride = static_cast<int32_t>(
+  handle->stride = static_cast<uint32_t>(
       gfx::RowSizeForBufferFormat(size.width(), format, 0));
   handle->handle = base::SharedMemory::DuplicateHandle(shared_memory.handle());
   return base::Bind(&Noop);
@@ -207,7 +207,7 @@ void GpuMemoryBufferImplSharedMemory::Unmap() {
   mapped_ = false;
 }
 
-int GpuMemoryBufferImplSharedMemory::stride(size_t plane) const {
+uint32_t GpuMemoryBufferImplSharedMemory::stride(size_t plane) const {
   DCHECK_LT(plane, gfx::NumberOfPlanesForBufferFormat(format_));
   return gfx::RowSizeForBufferFormat(size_.width(), format_, plane);
 }