Turn on UIPI for the GPU sandbox.

ui/gfx/gl/gl_switches.cc

 // Copyright (c) 2011 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 "ui/gfx/gl/gl_switches.h"
 
+namespace gfx {
+
+const char kGLImplementationDesktopName[] = "desktop";
+const char kGLImplementationOSMesaName[]  = "osmesa";
+const char kGLImplementationEGLName[]     = "egl";
+const char kGLImplementationMockName[]    = "mock";
+
+}  // namespace gfx
+
 namespace switches {
 
 // Stop the GPU from synchronizing on the vsync before presenting.
 const char kDisableGpuVsync[]               = "disable-gpu-vsync";
 
 // Select which implementation of GL the GPU process should use. Options are:
 //  desktop: whatever desktop OpenGL the user has installed (Linux and Mac
 //           default).
 //  egl: whatever EGL / GLES2 the user has installed (Windows default - actually
 //       ANGLE).
 //  osmesa: The OSMesa software renderer.
 const char kUseGL[]                         = "use-gl";
 
 // Turns on GPU logging (debug build only).
 const char kEnableGPUServiceLogging[]       = "enable-gpu-service-logging";
 const char kEnableGPUClientLogging[]        = "enable-gpu-client-logging";
 
 }  // namespace switches