ozone: Introduce ClientPixmap and ClientPixmapFactory for non-GPU processes.

ui/ozone/platform/drm/ozone_client_gbm.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/ozone_client_gbm.h"
+
+#include "ui/ozone/platform/drm/gbm_surface_client_factory.h"
+#include "ui/ozone/public/ozone_client.h"
+
+namespace ui {
+
+namespace {
+
+class OzoneClientGbm : public OzoneClient {
+ public:
+  OzoneClientGbm() {}
+  ~OzoneClientGbm() override {}
+
+  // OzoneClient:
+  SurfaceClientFactoryOzone* GetSurfaceClientFactoryOzone() override {
+    return surface_client_.get();
+  }
+
+  void InitializeUI() override {
+    if (!surface_client_)
+      surface_client_.reset(new GbmSurfaceClientFactory);
+  }
+
+  void InitializeRenderer() override {
+    if (!surface_client_)
+      surface_client_.reset(new GbmSurfaceClientFactory);
+  }
+
+ private:
+  scoped_ptr<GbmSurfaceClientFactory> surface_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(OzoneClientGbm);
+};
+
+}  // namespace
+
+OzoneClient* CreateOzoneClientGbm() {
+  return new OzoneClientGbm;
+}
+
+}  // namespace ui