Blacklist partial swaps on linux

ui/gl/gl_surface_glx.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.
 
 extern "C" {
 #include <X11/Xlib.h>
 }
 
 #include "ui/gl/gl_surface_glx.h"
 
@@ skipping 597 matching lines @@
 }
 
 gfx::Size NativeViewGLSurfaceGLX::GetSize() {
   return size_;
 }
 
 void* NativeViewGLSurfaceGLX::GetHandle() {
   return reinterpret_cast<void*>(GetDrawableHandle());
 }
 
-std::string NativeViewGLSurfaceGLX::GetExtensions() {
-  std::string extensions = GLSurface::GetExtensions();
-  if (gfx::g_driver_glx.ext.b_GLX_MESA_copy_sub_buffer) {
-    extensions += extensions.empty() ? "" : " ";
-    extensions += "GL_CHROMIUM_post_sub_buffer";
-  }
-  return extensions;
+bool NativeViewGLSurfaceGLX::SupportsPostSubBuffer() {
+  return gfx::g_driver_glx.ext.b_GLX_MESA_copy_sub_buffer;
 }
 
 void* NativeViewGLSurfaceGLX::GetConfig() {
   if (!config_) {
     // This code path is expensive, but we only take it when
     // attempting to use GLX_ARB_create_context_robustness, in which
     // case we need a GLXFBConfig for the window in order to create a
     // context for it.
     //
     // TODO(kbr): this is not a reliable code path. On platforms which
@@ skipping 159 matching lines @@
 
 void* PbufferGLSurfaceGLX::GetConfig() {
   return config_;
 }
 
 PbufferGLSurfaceGLX::~PbufferGLSurfaceGLX() {
   Destroy();
 }
 
 }  // namespace gfx