Make GL bindings conditional

ui/gl/gl_bindings.cc

Index: ui/gl/gl_bindings.cc
diff --git a/ui/gl/gl_bindings.cc b/ui/gl/gl_bindings.cc
new file mode 100644
index 0000000000000000000000000000000000000000..43c84e2e1ffc2357cfa165738cccd2f7d0d90d28
--- /dev/null
+++ b/ui/gl/gl_bindings.cc
@@ -0,0 +1,68 @@
+// Copyright 2014 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.
+
+#if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || defined(USE_OZONE)
+#include <EGL/egl.h>
+#endif
+
+#include "ui/gl/gl_bindings.h"
+
+#if defined(USE_X11)
+#include "ui/gfx/x/x11_types.h"
+#endif
+
+#if defined(OS_WIN)
+#include "ui/gl/gl_surface_wgl.h"
+#endif
+
+#if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || defined(USE_OZONE)
+#include "ui/gl/gl_surface_egl.h"
+#endif
+
+namespace gfx {
+
+std::string DriverOSMESA::GetPlatformExtensions() {
+  return "";
+}
+
+#if defined(OS_WIN)
+std::string DriverWGL::GetPlatformExtensions() {
+  const char* str = nullptr;
+  if (g_driver_wgl.fn.wglGetExtensionsStringARBFn) {
+    str = g_driver_wgl.fn.wglGetExtensionsStringARBFn(
+        GLSurfaceWGL::GetDisplayDC());
+  } else if (g_driver_wgl.fn.wglGetExtensionsStringEXTFn) {
+    str = g_driver_wgl.fn.wglGetExtensionsStringEXTFn();
+  }
+  return str ? std::string(str) : "";
+}
+#endif
+
+#if defined(OS_WIN) || defined(USE_X11) || defined(OS_ANDROID) || defined(USE_OZONE)
+std::string DriverEGL::GetPlatformExtensions() {
+  EGLDisplay display =
+#if defined(OS_WIN)
+    GLSurfaceEGL::GetPlatformDisplay(GetPlatformDefaultEGLNativeDisplay());
+#else
+    g_driver_egl.fn.eglGetDisplayFn(GetPlatformDefaultEGLNativeDisplay());
+#endif
+
+  DCHECK(g_driver_egl.fn.eglInitializeFn);
+  g_driver_egl.fn.eglInitializeFn(display, NULL, NULL);
+  DCHECK(g_driver_egl.fn.eglQueryStringFn);
+  const char* str = g_driver_egl.fn.eglQueryStringFn(display, EGL_EXTENSIONS);
+  return str ? std::string(str) : "";
+}
+#endif
+
+#if defined(USE_X11)
+std::string DriverGLX::GetPlatformExtensions() {
+  DCHECK(g_driver_glx.fn.glXQueryExtensionsStringFn);
+  const char* str =
+      g_driver_glx.fn.glXQueryExtensionsStringFn(gfx::GetXDisplay(), 0);
+  return str ? std::string(str) : "";
+}
+#endif
+
+}  // namespace gfx