Add plane manager to the atomic swap path.

ui/ozone/platform/dri/hardware_display_plane_manager.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 "ui/ozone/platform/dri/hardware_display_plane_manager.h"
+
+#include <drm.h>
+#include <errno.h>
+#include <xf86drm.h>
+
+#include "base/logging.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/ozone/platform/dri/dri_wrapper.h"
+
+namespace ui {
+
+HardwareDisplayPlaneManager::HardwareDisplayPlaneManager(DriWrapper* drm)
+    : drm_(drm), property_set_(NULL) {
+}
+
+HardwareDisplayPlaneManager::~HardwareDisplayPlaneManager() {
+  if (property_set_)
+    drmModePropertySetFree(property_set_);
+}
+
+bool HardwareDisplayPlaneManager::Initialize() {
+  ScopedDrmPlaneResPtr plane_resources(
+      drmModeGetPlaneResources(drm_->get_fd()));
+  if (!plane_resources) {
+    LOG(ERROR) << "Failed to get plane resources";

[dnicoara, 2014/07/22 20:48:32]

nit: Period at the end :)

+    return false;
+  }
+
+  property_set_ = drmModePropertySetAlloc();
+  if (!property_set_) {
+    LOG(ERROR) << "Failed to get property set";

[dnicoara, 2014/07/22 20:48:32]

s/get/allocate/ ?

+    return false;
+  }
+
+  uint32_t num_planes = plane_resources->count_planes;
+  for (uint32_t i = 0; i < num_planes; i++) {

[dnicoara, 2014/07/22 20:48:32]

nit: pre-increment. I'm conflicted about this one, especially since the coding
style says both are acceptable. I don't care either way, though in my experience
most reviewers want it pre-incremented. What's your take on it?

+    ScopedDrmPlanePtr drm_plane(
+        drmModeGetPlane(drm_->get_fd(), plane_resources->planes[i]));
+    if (!drm_plane) {
+      LOG(ERROR) << "Failed to get plane " << i;
+      return false;
+    }
+    scoped_ptr<HardwareDisplayPlane> plane(
+        new HardwareDisplayPlane(drm_, property_set_, drm_plane.Pass()));
+    if (plane->Initialize())
+      planes_.push_back(plane.release());
+  }
+
+  return true;
+}
+
+}  // namespace ui