Re-land: ui: Add GLImage unit test framework.

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 16 matching lines @@
 #include "ui/gfx/x/x11_types.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/sync_control_vsync_provider.h"
 
 namespace gfx {
 
 namespace {
 
 Display* g_display = nullptr;
-const char* g_glx_extensions = nullptr;
 bool g_glx_context_create = false;
 bool g_glx_create_context_robustness_supported = false;
 bool g_glx_texture_from_pixmap_supported = false;
 bool g_glx_oml_sync_control_supported = false;
 
 // Track support of glXGetMscRateOML separately from GLX_OML_sync_control as a
 // whole since on some platforms (e.g. crosbug.com/34585), glXGetMscRateOML
 // always fails even though GLX_OML_sync_control is reported as being supported.
 bool g_glx_get_msc_rate_oml_supported = false;
 
@@ skipping 294 matching lines @@
   if (!glXQueryVersion(g_display, &major, &minor)) {
     LOG(ERROR) << "glxQueryVersion failed";
     return false;
   }
 
   if (major == 1 && minor < 3) {
     LOG(ERROR) << "GLX 1.3 or later is required.";
     return false;
   }
 
-  g_glx_extensions = glXQueryExtensionsString(g_display, 0);
   g_glx_context_create =
       HasGLXExtension("GLX_ARB_create_context");
   g_glx_create_context_robustness_supported =
       HasGLXExtension("GLX_ARB_create_context_robustness");
   g_glx_texture_from_pixmap_supported =
       HasGLXExtension("GLX_EXT_texture_from_pixmap");
   g_glx_oml_sync_control_supported =
       HasGLXExtension("GLX_OML_sync_control");
   g_glx_get_msc_rate_oml_supported = g_glx_oml_sync_control_supported;
   g_glx_sgi_video_sync_supported =
       HasGLXExtension("GLX_SGI_video_sync");
 
   if (!g_glx_get_msc_rate_oml_supported && g_glx_sgi_video_sync_supported)
     SGIVideoSyncProviderThreadShim::display_ = gfx::OpenNewXDisplay();
 
   initialized = true;
   return true;
 }
 
 // static
 const char* GLSurfaceGLX::GetGLXExtensions() {
-  return g_glx_extensions;
+  return glXQueryExtensionsString(g_display, 0);
 }
 
 // static
 bool GLSurfaceGLX::HasGLXExtension(const char* name) {
   return ExtensionsContain(GetGLXExtensions(), name);
 }
 
 // static
 bool GLSurfaceGLX::IsCreateContextSupported() {
   return g_glx_context_create;
@@ skipping 251 matching lines @@
   if (!config_)
     config_ = GLSurfaceGLX::GetConfig(window_);
   return config_;
 }
 
 UnmappedNativeViewGLSurfaceGLX::~UnmappedNativeViewGLSurfaceGLX() {
   Destroy();
 }
 
 }  // namespace gfx