Use EGL_ANGLE_surface_orientation in Chrome to avoid a blit.

gpu/command_buffer/service/gles2_cmd_decoder.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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 3122 matching lines @@
 
 #if defined(OS_MACOSX)
   // This is unconditionally true on mac, no need to test for it at runtime.
   caps.iosurface = true;
 #endif
 
   caps.post_sub_buffer = supports_post_sub_buffer_;
   caps.commit_overlay_planes = supports_commit_overlay_planes_;
   caps.image = true;
   caps.surfaceless = surfaceless_;
+  bool is_offscreen = !!offscreen_target_frame_buffer_.get();
+  caps.flips_vertically = !is_offscreen && surface_->FlipsVertically();
 
   caps.blend_equation_advanced =
       feature_info_->feature_flags().blend_equation_advanced;
   caps.blend_equation_advanced_coherent =
       feature_info_->feature_flags().blend_equation_advanced_coherent;
   caps.texture_rg = feature_info_->feature_flags().ext_texture_rg;
   caps.image_ycbcr_422 =
       feature_info_->feature_flags().chromium_image_ycbcr_422;
   caps.max_copy_texture_chromium_size =
       feature_info_->workarounds().max_copy_texture_chromium_size;
@@ skipping 12609 matching lines @@
   return error::kNoError;
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu