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

ui/ozone/platform/drm/common/native_pixmap_manager_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/common/native_pixmap_manager_gbm.h"
+
+#include "ui/ozone/public/native_pixmap_manager.h"
+
+namespace ui {
+
+namespace {
+
+class NativePixmapManagerGbm : public NativePixmapManager {
+ public:
+  NativePixmapManagerGbm() {}
+  ~NativePixmapManagerGbm() override {}
+
+  // NativePixmapManager:
+  std::vector<Configuration> GetSupportedNativePixmapConfigurations()
+      const override {
+    std::vector<Configuration> configurations = {
+        {SurfaceFactoryOzone::BGRA_8888, SurfaceFactoryOzone::SCANOUT},
+        {SurfaceFactoryOzone::RGBX_8888, SurfaceFactoryOzone::SCANOUT}};
+    return configurations;
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativePixmapManagerGbm);
+};
+
+}  // namespace
+
+NativePixmapManager* CreateNativePixmapManagerGbm() {
+  return new NativePixmapManagerGbm();
+}
+
+}  // namespace ui