Flush command streams after deleting resources

gpu/command_buffer/build_gles2_cmd_buffer.py

Index: gpu/command_buffer/build_gles2_cmd_buffer.py
diff --git a/gpu/command_buffer/build_gles2_cmd_buffer.py b/gpu/command_buffer/build_gles2_cmd_buffer.py
index 1158825a49cf3558abf845f4ab990bc8a24ad87c..ee7d6defe7a93087aebd251a57fc6f2aed4f0768 100755
--- a/gpu/command_buffer/build_gles2_cmd_buffer.py
+++ b/gpu/command_buffer/build_gles2_cmd_buffer.py
@@ -3072,6 +3072,7 @@ class DeleteHandler(TypeHandler):
                func.GetOriginalArgs()[-1].name)
     file.Write("  helper_->%s(%s);\n" %
                (func.name, func.MakeCmdArgString("")))
+    file.Write("  Flush();\n")
     file.Write("}\n")
     file.Write("\n")
 
@@ -3201,6 +3202,7 @@ TEST_F(%(test_name)s, %(name)sInvalidArgs) {
         arg.WriteClientSideValidationCode(file, func)
       code = """  %(name)sHelper(%(args)s);
   helper_->%(name)sImmediate(%(args)s);
+  Flush();
 }
 
 """