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

ui/ozone/platform/drm/gpu/gbm_surface_factory.cc

Index: ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
diff --git a/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc b/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
index 38b5baf89d4e3db8589359739730caf1d62d02b8..1ef76b2bf88664465b3930fbdc72fb04e3eea096 100644
--- a/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
@@ -107,13 +107,12 @@ GbmSurfaceFactory::CreateSurfacelessEGLSurfaceForWidget(
 scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
     gfx::AcceleratedWidget widget,
     gfx::Size size,
-    BufferFormat format,
-    BufferUsage usage) {
+    NativePixmapFormat format,
+    NativePixmapUsage usage) {
 #if !defined(OS_CHROMEOS)
   // Support for memory mapping accelerated buffers requires some
   // CrOS-specific patches (using vgem).
-  if (usage != SCANOUT)
-    return nullptr;
+  DCHECK_EQ(NATIVE_PIXMAP_USAGE_SCANOUT, usage);
 #endif
 
   scoped_refptr<GbmDevice> gbm = GetGbmDevice(widget);
@@ -136,20 +135,6 @@ bool GbmSurfaceFactory::CanShowPrimaryPlaneAsOverlay() {
   return allow_surfaceless_;
 }
 
-bool GbmSurfaceFactory::CanCreateNativePixmap(BufferUsage usage) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  switch (usage) {
-    case MAP:
-      return false;
-    case PERSISTENT_MAP:
-      return false;
-    case SCANOUT:
-      return true;
-  }
-  NOTREACHED();
-  return false;
-}
-
 scoped_refptr<GbmDevice> GbmSurfaceFactory::GetGbmDevice(
     gfx::AcceleratedWidget widget) {
   return static_cast<GbmDevice*>(