Move SharedMemoryLimits out of WebGraphicsContext3DCommandBufferImpl.

gpu/command_buffer/client/shared_memory_limits.h

+// Copyright 2016 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.
+
+#ifndef GPU_COMMAND_BUFFER_CLIENT_SHARED_MEMORY_LIMITS_H_
+#define GPU_COMMAND_BUFFER_CLIENT_SHARED_MEMORY_LIMITS_H_
+
+#include <stddef.h>
+
+namespace gpu {
+
+struct SharedMemoryLimits {
+  size_t command_buffer_size = 1024 * 1024;

[danakj, 2016/04/20 02:11:20]

Turns out these sizes don't match what the code in gpu::gles2 is expecting, and
we get narrowing conversions now.

This one should be int32_t which is what CommandBufferHelper takes.

The other four are "unsigned int" in GLES2Implementation, but I made them
uint32_t here cuz unsigned is terrible.

+  size_t start_transfer_buffer_size = 1 * 1024 * 1024;
+  size_t min_transfer_buffer_size = 1 * 256 * 1024;
+  size_t max_transfer_buffer_size = 16 * 1024 * 1024;
+
+  static constexpr size_t kNoLimit = 0;
+  size_t mapped_memory_reclaim_limit = kNoLimit;
+};
+
+}  // namespace gpu
+
+#endif  // GPU_COMMAND_BUFFER_CLIENT_SHARED_MEMORY_LIMITS_H_