Propagate supported scanout formats from driver to SurfaceFactoryOzone.

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 "build/build_config.h"
@@ skipping 85 matching lines @@
 }
 
 scoped_ptr<SurfaceOzoneEGL>
 GbmSurfaceFactory::CreateSurfacelessEGLSurfaceForWidget(
     gfx::AcceleratedWidget widget) {
   DCHECK(thread_checker_.CalledOnValidThread());
   return make_scoped_ptr(
       new GbmSurfaceless(drm_thread_->CreateDrmWindowProxy(widget), this));
 }
 
+void GbmSurfaceFactory::GetSupportedFormats(
+    std::vector<uint32_t>* support_formats) {
+  if (drm_thread_ != nullptr)
+    drm_thread_->GetSupportedFormats(support_formats);

[kalyank, 2016/01/19 07:34:22]

We can cache them here? no need to post a synchronous task for DrmThread every
time. 

[william.xie, 2016/01/19 10:07:07]

Done.

+}
+
 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).
   DCHECK(gfx::BufferUsage::SCANOUT == usage);
 #endif
@@ skipping 11 matching lines @@
 }
 
 scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmapFromHandle(
     const gfx::NativePixmapHandle& handle) {
   scoped_refptr<GbmPixmap> pixmap(new GbmPixmap(this));
   pixmap->Initialize(base::ScopedFD(handle.fd.fd), handle.stride);
   return pixmap;
 }
 
 }  // namespace ui