Query the preferred readback config in CopyFromBackingStore

content/common/gpu/client/gl_helper.cc

 // Copyright (c) 2012 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 "content/common/gpu/client/gl_helper.h"
 
 #include <queue>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 1135 matching lines @@
       base::Bind(&CallbackKeepingVideoFrameAlive, target, callback));
   gl_->BindFramebuffer(GL_FRAMEBUFFER, 0);
   media::LetterboxYUV(target, dst_subrect_);
 }
 
 bool GLHelper::IsReadbackConfigSupported(SkBitmap::Config texture_format) {
   DCHECK(readback_support_.get());
   return readback_support_.get()->IsReadbackConfigSupported(texture_format);
 }
 
+SkBitmap::Config GLHelper::PreferredReadbackFormat() {
+  DCHECK(readback_support_.get());
+  return readback_support_.get()->PreferredReadbackFormat();
+}
+
 ReadbackYUVInterface* GLHelper::CopyTextureToImpl::CreateReadbackPipelineYUV(
     GLHelper::ScalerQuality quality,
     const gfx::Size& src_size,
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
     const gfx::Rect& dst_subrect,
     bool flip_vertically,
     bool use_mrt) {
   helper_->InitScalerImpl();
   if (max_draw_buffers_ >= 2 && use_mrt) {
@@ skipping 30 matching lines @@
   return copy_texture_to_impl_->CreateReadbackPipelineYUV(quality,
                                                           src_size,
                                                           src_subrect,
                                                           dst_size,
                                                           dst_subrect,
                                                           flip_vertically,
                                                           use_mrt);
 }
 
 }  // namespace content