Remove ui_compositor_image_transport, it has no effect.

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 <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 5122 matching lines @@
 
   GLuint width = static_cast<GLuint>(c.width);
   GLuint height = static_cast<GLuint>(c.height);
   GLfloat scale_factor = c.scale_factor;
   GLboolean has_alpha = c.alpha;
   TRACE_EVENT2("gpu", "glResizeChromium", "width", width, "height", height);
 
   width = std::max(1U, width);
   height = std::max(1U, height);
 
-#if defined(OS_POSIX) && !defined(OS_MACOSX) && \
-    !defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
-  // Make sure that we are done drawing to the back buffer before resizing.

[Nico, 2017/03/11 18:30:01]

I'm unsure about this bit; it might still be needed on Android? It looks like
this was added explicitly for linux here long ago:
https://codereview.chromium.org/5105006 So even though it might run on android
(not sure if we use glResizeCHROMIUM there), it's probably not intentional.

-  glFinish();
-#endif
   bool is_offscreen = !!offscreen_target_frame_buffer_.get();
   if (is_offscreen) {
     if (!ResizeOffscreenFramebuffer(gfx::Size(width, height))) {
       LOG(ERROR) << "GLES2DecoderImpl: Context lost because "
                  << "ResizeOffscreenFramebuffer failed.";
       return error::kLostContext;
     }
   } else {
     if (!surface_->Resize(gfx::Size(width, height), scale_factor,
                           !!has_alpha)) {
@@ skipping 14177 matching lines @@
 }
 
 // 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 "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu