media: Add MediaOzonePlatform support

media/ozone/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/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 {
+
+// the following are just convenient stubs and need to be removed once the
+// internal platforms decide to actually implement their media specifics
+OzonePlatformMedia* CreateOzonePlatformMediaDri() { return NULL; }

[spang, 2014/06/09 19:17:32]

You are dereferencing this NULL elsewhere.

For now, could add a StubOzonePlatformMedia.

[vignatti (out of this project), 2014/06/09 20:30:27]

Done.

+OzonePlatformMedia* CreateOzonePlatformMediaEgltest() { return NULL; }
+OzonePlatformMedia* CreateOzonePlatformMediaTest() { return NULL; }
+
+OzonePlatformMedia::OzonePlatformMedia() {
+  CHECK(!instance_) << "There should only be a single OzonePlatformMedia.";
+  instance_ = this;
+}
+
+OzonePlatformMedia::~OzonePlatformMedia() {
+  CHECK_EQ(instance_, this);
+  instance_ = NULL;
+}
+
+// static
+OzonePlatformMedia* OzonePlatformMedia::GetInstance() {
+  if (!instance_)
+    CreateInstance();
+  return instance_;
+}
+
+VideoDecodeAccelerator* OzonePlatformMedia::CreateVideoDecodeFactoryOzone(
+    const base::Callback<bool(void)>& make_context_current) {
+  NOTIMPLEMENTED();
+  return NULL;
+}
+
+// static
+void OzonePlatformMedia::CreateInstance() {
+  if (!instance_) {
+    TRACE_EVENT1("ozone",
+                 "OzonePlatformMedia::Initialize",
+                 "platform",
+                 ui::GetOzonePlatformName());
+    scoped_ptr<OzonePlatformMedia> platform =
+        ui::PlatformObject<OzonePlatformMedia>::Create();
+
+    // TODO(spang): Currently need to leak this object.
+    CHECK_EQ(instance_, platform.release());
+  }
+}
+
+// static
+OzonePlatformMedia* OzonePlatformMedia::instance_;
+
+}  // namespace media