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

ui/ozone/platform/drm/gpu/gbm_surface_factory.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/drm/gpu/gbm_surface_factory.h"
 
 #include <gbm.h>
 
 #include "base/files/file_path.h"
 #include "third_party/khronos/EGL/egl.h"
@@ skipping 94 matching lines @@
 }
 
 scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
     gfx::AcceleratedWidget widget,
     gfx::Size size,
     gfx::BufferFormat format,
     gfx::BufferUsage 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(gfx::BufferUsage::SCANOUT, usage);
 #endif
 
   scoped_refptr<GbmDevice> gbm = GetGbmDevice(widget);
   DCHECK(gbm);
 
   scoped_refptr<GbmBuffer> buffer =
       GbmBuffer::CreateBuffer(gbm, format, size, usage);
   if (!buffer.get())
     return nullptr;
 
   scoped_refptr<GbmPixmap> pixmap(new GbmPixmap(buffer, screen_manager_));
   if (!pixmap->Initialize())
     return nullptr;
 
   return pixmap;
 }
 
 bool GbmSurfaceFactory::CanShowPrimaryPlaneAsOverlay() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return allow_surfaceless_;
 }
 
-bool GbmSurfaceFactory::CanCreateNativePixmap(gfx::BufferUsage usage) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  switch (usage) {
-    case gfx::BufferUsage::MAP:
-      return false;
-    case gfx::BufferUsage::PERSISTENT_MAP:
-      return false;
-    case gfx::BufferUsage::SCANOUT:
-      return true;
-  }
-  NOTREACHED();
-  return false;
-}
-
 scoped_refptr<GbmDevice> GbmSurfaceFactory::GetGbmDevice(
     gfx::AcceleratedWidget widget) {
   return static_cast<GbmDevice*>(
       drm_device_manager_->GetDrmDevice(widget).get());
 }
 
 }  // namespace ui