gpu: support RG_88 GpuMemoryBuffer

ui/ozone/platform/drm/client_native_pixmap_factory_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/client_native_pixmap_factory_gbm.h"
 
 #include <utility>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 44 matching lines @@
                format == gfx::BufferFormat::BGRX_8888 ||
                format == gfx::BufferFormat::YVU_420;
       case gfx::BufferUsage::SCANOUT:
         return format == gfx::BufferFormat::BGRX_8888 ||
                format == gfx::BufferFormat::RGBX_8888;
       case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
       case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT: {
 #if defined(OS_CHROMEOS)
         return
 #if defined(ARCH_CPU_X86_FAMILY)
-            // Currently only Intel driver (i.e. minigbm and Mesa) supports R_8.
-            // crbug.com/356871
+            // Currently only Intel driver (i.e. minigbm and Mesa) supports R_8
+            // and RG_88. crbug.com/356871
             format == gfx::BufferFormat::R_8 ||
+            format == gfx::BufferFormat::RG_88 ||
 #endif
             format == gfx::BufferFormat::BGRA_8888;
 #else
         return false;
 #endif
       }
     }
     NOTREACHED();
     return false;
   }
@@ skipping 23 matching lines @@
   }
 
   DISALLOW_COPY_AND_ASSIGN(ClientNativePixmapFactoryGbm);
 };
 
 ClientNativePixmapFactory* CreateClientNativePixmapFactoryGbm() {
   return new ClientNativePixmapFactoryGbm();
 }
 
 }  // namespace ui