Force a swap on resize to work around Intel driver issues with PostSubBuffer.

ui/gfx/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/gfx/gl/gl_surface_glx.h"
 
@@ skipping 106 matching lines @@
   Destroy();
 }
 
 bool NativeViewGLSurfaceGLX::Initialize() {
   return true;
 }
 
 void NativeViewGLSurfaceGLX::Destroy() {
 }
 
+bool NativeViewGLSurfaceGLX::Resize(const gfx::Size& size) {
+  // On Intel drivers, the frame buffer won't be resize until the next swap. If
+  // we only do PostSubBuffer, then we're stuck in the old size. Force a swap
+  // now.
+  if (gfx::g_GLX_MESA_copy_sub_buffer)
+    SwapBuffers();
+  return true;
+}
+
 bool NativeViewGLSurfaceGLX::IsOffscreen() {
   return false;
 }
 
 bool NativeViewGLSurfaceGLX::SwapBuffers() {
   glXSwapBuffers(g_display, window_);
   return true;
 }
 
 gfx::Size NativeViewGLSurfaceGLX::GetSize() {
@@ skipping 169 matching lines @@
 
 void* PbufferGLSurfaceGLX::GetHandle() {
   return reinterpret_cast<void*>(pbuffer_);
 }
 
 void* PbufferGLSurfaceGLX::GetConfig() {
   return config_;
 }
 
 }  // namespace gfx