Propagate supported scanout formats from driver to SurfaceFactoryOzone.

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 fb9157bc9a8c451910725be872aa1cf7b80d56a4..2eb0661a2b59dbec3dca0d2d717d1f651c03c2a8 100644
--- a/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_surface_factory.cc
@@ -10,6 +10,7 @@
 #include "build/build_config.h"
 #include "third_party/khronos/EGL/egl.h"
 #include "ui/ozone/common/egl_util.h"
+#include "ui/ozone/platform/drm/common/drm_util.h"
 #include "ui/ozone/platform/drm/gpu/drm_thread_proxy.h"
 #include "ui/ozone/platform/drm/gpu/drm_window_proxy.h"
 #include "ui/ozone/platform/drm/gpu/gbm_buffer.h"
@@ -103,6 +104,13 @@ GbmSurfaceFactory::CreateSurfacelessEGLSurfaceForWidget(
       new GbmSurfaceless(drm_thread_->CreateDrmWindowProxy(widget), this));
 }
 
+std::vector<gfx::BufferFormat> GbmSurfaceFactory::GetScanoutFormats(
+    gfx::AcceleratedWidget widget) {
+  if (scanout_formats_.empty())

[kalyank, 2016/01/22 06:41:25]

This now looks wrong as widget might be associated with a different device and
cached formats might not be supported. We would need to query this every time by
posting a task to DrmThread, like in your initial patch. 

[william.xie, 2016/01/23 01:51:53]

Done.

+    drm_thread_->GetScanoutFormats(widget, &scanout_formats_);
+  return scanout_formats_;
+}
+
 scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
     gfx::AcceleratedWidget widget,
     gfx::Size size,