gpu: Add GpuFence framework.

gpu/ipc/client/gpu_fence_impl.cc

+// 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.
+
+#include "gpu/ipc/client/gpu_fence_impl.h"
+
+#include "base/logging.h"
+#include "build/build_config.h"
+
+namespace gpu {
+
+GpuFenceImpl::GpuFenceImpl() {}
+
+GpuFenceImpl::GpuFenceImpl(const gfx::GpuFenceHandle& handle)
+    : shared_event_(handle.shared_event_handle) {}
+
+GpuFenceImpl::~GpuFenceImpl() {}
+
+// static
+gfx::GpuFenceHandle GpuFenceImpl::CreateForChildProcess(
+    base::ProcessHandle child_process) {
+  gfx::GpuFenceHandle handle;
+  handle.shared_event_handle =
+      gfx::SharedEvent::CreateForProcess(child_process);
+  return handle;
+}
+
+// static
+GpuFenceImpl* GpuFenceImpl::FromClientFence(ClientFence fence) {
+  return reinterpret_cast<GpuFenceImpl*>(fence);
+}
+
+bool GpuFenceImpl::IsSignaled() {
+  return shared_event_.IsSignaled();
+}
+
+bool GpuFenceImpl::Wait(const base::TimeDelta& max_time) {
+  return shared_event_.Wait(max_time);
+}
+
+void GpuFenceImpl::Reset() {
+  return shared_event_.Reset();
+}
+
+gfx::GpuFenceHandle GpuFenceImpl::GetHandle() const {
+  gfx::GpuFenceHandle handle;
+  handle.shared_event_handle = shared_event_.GetHandle();
+  return handle;
+}
+
+ClientFence GpuFenceImpl::AsClientFence() {
+  return reinterpret_cast<ClientFence>(this);
+}
+
+}  // namespace gpu