Propagate supported scanout formats from driver to SurfaceFactoryOzone.

ui/ozone/public/surface_factory_ozone.h

 // Copyright (c) 2013 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.
 
 #ifndef UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
 #define UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
@@ skipping 82 matching lines @@
       AddGLLibraryCallback add_gl_library,
       SetGLGetProcAddressProcCallback set_gl_get_proc_address) = 0;
 
   // Returns an array of EGL properties, which can be used in any EGL function
   // used to select a display configuration. Note that all properties should be
   // immediately followed by the corresponding desired value and array should be
   // terminated with EGL_NONE. Ownership of the array is not transferred to
   // caller. desired_list contains list of desired EGL properties and values.
   virtual const int32_t* GetEGLSurfaceProperties(const int32_t* desired_list);
 
+  // Returns all formats which can be scanned out by this PlaneManager for the
+  // specified gfx::AcceleratedWidget. Be careful that secondary device may not
+  // have all the formats of the primary device.

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

Nit: I think you can remove the comment about secondary device as we now check
for the display controller to which |window| is associated and return the
formats supported by it. Also, PlaneManager is bit confusing here and everywhere
else, comments similar to what we have for CreateNativePixmap below should be
good ?

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

Done.

+  virtual std::vector<gfx::BufferFormat> GetScanoutFormats(
+      gfx::AcceleratedWidget widget);
+
   // Create a single native buffer to be used for overlay planes or zero copy
   // for |widget| representing a particular display controller or default
   // display controller for kNullAcceleratedWidget.
   // It can be called on any thread.
   virtual scoped_refptr<NativePixmap> CreateNativePixmap(
       gfx::AcceleratedWidget widget,
       gfx::Size size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage);
 
   // Create a single native buffer from an existing handle. Takes ownership of
   // |handle| and can be called on any thread.
   virtual scoped_refptr<NativePixmap> CreateNativePixmapFromHandle(
       const gfx::NativePixmapHandle& handle);
 
  protected:
   SurfaceFactoryOzone();
   virtual ~SurfaceFactoryOzone();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SurfaceFactoryOzone);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_