media: Add MediaOzonePlatform support

media/ozone/media_ozone_platform.cc

+// Copyright 2014 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 "media/ozone/media_ozone_platform.h"
+
+#include "base/debug/trace_event.h"
+#include "base/logging.h"
+#include "ui/ozone/platform_object.h"
+#include "ui/ozone/platform_selection.h"
+
+namespace media {
+
+namespace {
+
+class MediaOzonePlatformStub : public MediaOzonePlatform {
+ public:
+  MediaOzonePlatformStub() {}
+
+  virtual ~MediaOzonePlatformStub() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MediaOzonePlatformStub);
+};
+
+}  // namespace
+
+// The following statics are just convenient stubs, declared by the
+// generate_constructor_list.py script. They should be removed once the
+// internal Ozone platforms decide to actually implement their media specifics.
+MediaOzonePlatform* CreateMediaOzonePlatformCaca() {
+  return new MediaOzonePlatformStub;
+}
+
+MediaOzonePlatform* CreateMediaOzonePlatformDri() {
+  return new MediaOzonePlatformStub;
+}
+
+MediaOzonePlatform* CreateMediaOzonePlatformEgltest() {
+  return new MediaOzonePlatformStub;
+}
+
+MediaOzonePlatform* CreateMediaOzonePlatformGbm() {
+  return new MediaOzonePlatformStub;
+}
+
+MediaOzonePlatform* CreateMediaOzonePlatformTest() {
+  return new MediaOzonePlatformStub;
+}
+
+MediaOzonePlatform::MediaOzonePlatform() {
+  CHECK(!instance_) << "There should only be a single MediaOzonePlatform.";
+  instance_ = this;
+}
+
+MediaOzonePlatform::~MediaOzonePlatform() {
+  CHECK_EQ(instance_, this);
+  instance_ = NULL;
+}
+
+// static
+MediaOzonePlatform* MediaOzonePlatform::GetInstance() {
+  if (!instance_)
+    CreateInstance();
+  return instance_;
+}
+
+VideoDecodeAccelerator* MediaOzonePlatform::CreateVideoDecodeAccelerator(
+    const base::Callback<bool(void)>& make_context_current) {
+  NOTIMPLEMENTED();
+  return NULL;
+}
+
+// static
+void MediaOzonePlatform::CreateInstance() {
+  if (instance_)
+    return;
+
+  TRACE_EVENT1("ozone",
+               "MediaOzonePlatform::Initialize",
+               "platform",
+               ui::GetOzonePlatformName());
+  scoped_ptr<MediaOzonePlatform> platform =
+      ui::PlatformObject<MediaOzonePlatform>::Create();
+
+  // TODO(spang): Currently need to leak this object.
+  CHECK_EQ(instance_, platform.release());
+}
+
+// static
+MediaOzonePlatform* MediaOzonePlatform::instance_;
+
+}  // namespace media