aura: Fix views_unittests on linux.

ui/aura/test_suite.cc

Index: ui/aura/test_suite.cc
diff --git a/ui/aura/test_suite.cc b/ui/aura/test_suite.cc
index 8d8c68c34cc3000e087d363a1456ff4513aef6b4..ff1cc02fe12cd2b5f9922c2529810aa57ce2b750 100644
--- a/ui/aura/test_suite.cc
+++ b/ui/aura/test_suite.cc
@@ -10,11 +10,15 @@
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
 #include "ui/gfx/gfx_paths.h"
+#include "ui/gfx/gl/gl_implementation.h"
 
 AuraTestSuite::AuraTestSuite(int argc, char** argv)
     : TestSuite(argc, argv) {}
 
 void AuraTestSuite::Initialize() {
+#if defined(OS_LINUX)
+  gfx::InitializeGLBindings(gfx::kGLImplementationOSMesaGL);
+#endif
   base::TestSuite::Initialize();
 
   gfx::RegisterPathProvider();