drm: GPU process manages VGEM fd.

ui/ozone/platform/drm/gpu/drm_device_manager.h

Index: ui/ozone/platform/drm/gpu/drm_device_manager.h
diff --git a/ui/ozone/platform/drm/gpu/drm_device_manager.h b/ui/ozone/platform/drm/gpu/drm_device_manager.h
index 34fe61335d62cb1bb9165d8ef3d7ea0467130f68..8e74cde70f020b7da548f9b7672f15019a7a0e0d 100644
--- a/ui/ozone/platform/drm/gpu/drm_device_manager.h
+++ b/ui/ozone/platform/drm/gpu/drm_device_manager.h
@@ -8,6 +8,8 @@
 #include <map>
 #include <vector>
 
+#include "base/files/file_path.h"
+#include "base/files/scoped_file.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
@@ -16,7 +18,6 @@
 #include "ui/ozone/ozone_export.h"
 
 namespace base {
-class FilePath;
 struct FileDescriptor;
 class SingleThreadTaskRunner;
 }
@@ -38,7 +39,9 @@ class OZONE_EXPORT DrmDeviceManager {
   ~DrmDeviceManager();
 
   // The first device registered is assumed to be the primary device.
-  bool AddDrmDevice(const base::FilePath& path, const base::FileDescriptor& fd);
+  bool AddDrmDevice(const base::FilePath& path,
+                    const base::FileDescriptor& fd,
+                    bool is_vgem);
   void RemoveDrmDevice(const base::FilePath& path);
 
   void InitializeIOTaskRunner(
@@ -57,6 +60,8 @@ class OZONE_EXPORT DrmDeviceManager {
 
   const DrmDeviceVector& GetDrmDevices() const;
 
+  int GetVgemDevice() const;

[dshwang, 2015/05/11 13:25:33]

This method is needed to implement zero/one-copy texture.
See
https://codereview.chromium.org/1134993003/diff/1/ui/ozone/platform/drm/gbm_s...

+
  private:
   // With the exception of GetDrmDevice() all functions must be called on GPU
   // main.
@@ -78,6 +83,9 @@ class OZONE_EXPORT DrmDeviceManager {
   // display; ie: when in headless mode).
   scoped_refptr<DrmDevice> primary_device_;
 
+  base::ScopedFD vgem_device_;
+  base::FilePath vgem_path_;
+
   // This class is accessed from the main thread and the IO thread. This lock
   // protects access to the device map.
   base::Lock lock_;