Make command buffer free transfer buffer when switching tabs

gpu/command_buffer/build_gles2_cmd_buffer.py

 #!/usr/bin/env python
 # 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.
 
 """code generator for GLES2 command buffers."""
 
 import os
 import os.path
 import sys
@@ skipping 3371 matching lines @@
           ", ".join(["%s" % arg.name for arg in all_but_last_args]))
       all_arg_string = (
           ", ".join(["%s" % arg.name for arg in func.GetOriginalArgs()]))
       code = """  if (%(func_name)sHelper(%(all_arg_string)s)) {
     return;
   }
   typedef %(func_name)s::Result Result;
   Result* result = GetResultAs<Result*>();
   result->SetNumResults(0);
   helper_->%(func_name)s(%(arg_string)s,
-      result_shm_id(), result_shm_offset());
+      GetResultShmId(), GetResultShmOffset());
   WaitForCmd();
   result->CopyResult(params);
   GPU_CLIENT_LOG_CODE_BLOCK({
     for (int32 i = 0; i < result->GetNumResults(); ++i) {
       GPU_CLIENT_LOG("  " << i << ": " << result->GetData()[i]);
     }
   });
 }
 """
       file.Write(code % {
@@ skipping 774 matching lines @@
                   func.MakeTypedOriginalArgString("")))
       func.WriteDestinationInitalizationValidation(file)
       self.WriteClientGLCallLog(func, file)
       file.Write("  typedef %s::Result Result;\n" % func.name)
       file.Write("  Result* result = GetResultAs<Result*>();\n")
       file.Write("  *result = 0;\n")
       arg_string = func.MakeOriginalArgString("")
       comma = ""
       if len(arg_string) > 0:
         comma = ", "
-      file.Write("  helper_->%s(%s%sresult_shm_id(), result_shm_offset());\n" %
+      file.Write(
+          "  helper_->%s(%s%sGetResultShmId(), GetResultShmOffset());\n" %
                  (func.name, arg_string, comma))
       file.Write("  WaitForCmd();\n")
       file.Write('  GPU_CLIENT_LOG("returned " << *result);\n')
       file.Write("  return *result;\n")
       file.Write("}\n")
       file.Write("\n")
     else:
       self.WriteGLES2ImplementationDeclaration(func, file)
 
 
@@ skipping 1792 matching lines @@
       gen.WriteDocs("docs/gles2_cmd_format_docs_autogen.h")
 
   if gen.errors > 0:
     print "%d errors" % gen.errors
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))