Prevent crash when using getExtension while a PBO is bound.

gpu/command_buffer/service/test_helper.h

Index: gpu/command_buffer/service/test_helper.h
diff --git a/gpu/command_buffer/service/test_helper.h b/gpu/command_buffer/service/test_helper.h
index 6663e92d44a8ca42d6ffe1dfd62d99e0ee462590..0169e4c6456972840b75858b43a0c95f9a9c7ae4 100644
--- a/gpu/command_buffer/service/test_helper.h
+++ b/gpu/command_buffer/service/test_helper.h
@@ -10,6 +10,7 @@
 #include <string>
 #include <vector>
 
+#include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/shader_translator.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_mock.h"
@@ -106,6 +107,7 @@ class TestHelper {
       const DisallowedFeatures& disallowed_features,
       const char* extensions,
       const char* gl_version,
+      ContextType context_type,
       bool bind_generates_resource);
   static void SetupFeatureInfoInitExpectations(::gl::MockGLInterface* gl,
                                                const char* extensions);
@@ -114,6 +116,7 @@ class TestHelper {
       const char* extensions,
       const char* gl_renderer,
       const char* gl_version,
+      ContextType context_type,
       bool enable_es3 = false);
   static void SetupTextureManagerInitExpectations(::gl::MockGLInterface* gl,
                                                   bool is_es3_enabled,