Add GL_CHROMIUM_screen_space_antialiasing to support alternative AA

gpu/command_buffer/client/gles2_c_lib_autogen.h

Index: gpu/command_buffer/client/gles2_c_lib_autogen.h
diff --git a/gpu/command_buffer/client/gles2_c_lib_autogen.h b/gpu/command_buffer/client/gles2_c_lib_autogen.h
index 989c500a03cb12e17988b460a26c5e9f36d816e4..f0fd05296a2246d662982d679737fa7cbfb3c233 100644
--- a/gpu/command_buffer/client/gles2_c_lib_autogen.h
+++ b/gpu/command_buffer/client/gles2_c_lib_autogen.h
@@ -1617,6 +1617,9 @@ GLenum GL_APIENTRY GLES2GetGraphicsResetStatusKHR() {
 void GL_APIENTRY GLES2BlendBarrierKHR() {
   gles2::GetGLContext()->BlendBarrierKHR();
 }
+void GL_APIENTRY GLES2ApplyScreenSpaceAntialiasing() {
+  gles2::GetGLContext()->ApplyScreenSpaceAntialiasing();
+}
 
 namespace gles2 {
 
@@ -2863,6 +2866,10 @@ extern const NameToFunc g_gles2_function_table[] = {
         reinterpret_cast<GLES2FunctionPointer>(glBlendBarrierKHR),
     },
     {
+        "glApplyScreenSpaceAntialiasing",
+        reinterpret_cast<GLES2FunctionPointer>(glApplyScreenSpaceAntialiasing),
+    },
+    {
         NULL, NULL,
     },
 };