native_viewport support for ozone

ui/ozone/platform/drm/mojo/drm_host_impl.cc

+// Copyright 2015 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 "ui/ozone/platform/drm/mojo/drm_host_impl.h"
+
+#include "base/logging.h"
+#include "base/process/process.h"
+#include "mojo/converters/ozone_drm_gpu/ozone_drm_gpu_type_converters.h"
+#include "ui/ozone/public/ozone_platform.h"
+
+namespace ui {
+
+MojoDrmHostImpl::MojoDrmHostImpl(
+    mojo::InterfaceRequest<mojo::OzoneDrmHost> request)
+    : platform_support_(static_cast<ui::DrmGpuPlatformSupportHost*>(
+          ui::OzonePlatform::GetInstance()
+              ->GetGpuPlatformSupportHost())),
+      binding_(this, request.Pass()) {
+  platform_support_->OnChannelEstablished(base::Process::Current().Pid());

[jamesr, 2015/08/27 19:35:47]

does this need the actual pid? what does it use it for?

[cdotstout, 2015/08/27 21:28:33]

Some ipc mechanisms may need it.  Drm/mojo doesn't use it.

[spang, 2015/08/28 19:38:20]

The number is used for handling GPU process restarts. Upon restart,
OnChannelDestroyed(old_host_id) and OnChannelEstablished(new_host_id) are both
called, but content/ does not guarantee the ordering of the calls. See also
GpuProcessHostUIShim.

Since we can't rely on order, the id resolves an ambiguity on what to do in
OnChannelDestroyed. It either does nothing (new channel already open) or cleans
up (new channel not available yet).

The only thing that matters is that each new channel uses a different number.

+}
+
+MojoDrmHostImpl::~MojoDrmHostImpl() {}
+
+void MojoDrmHostImpl::UpdateNativeDisplays(
+    mojo::Array<mojo::DisplaySnapshotPtr> displays) {
+  platform_support_->get_display_manager()->OnUpdateNativeDisplays(
+      displays.To<std::vector<ui::DisplaySnapshot_Params>>());
+}
+
+void MojoDrmHostImpl::DisplayConfigured(int64_t id, bool result) {
+  platform_support_->get_display_manager()->OnDisplayConfigured(id, result);
+}
+
+}  // namespace ui