mshtml: Added IHTMLTableRow::bgColor property implementation.

[Zhenbo Li]

try 2:
1. Use a new method to implement HTMLTableRow_get_bgColor
    to fix test failure.
(For doing that, I have to declare nscolor_to_str in
  mshtml_private.h, too)
2. Restore originial color in testcase.

try 1:
As MSDN said, bgColor property can be a VARIANT of type VT_BSTR or VT_I4
that receives one of the color names or RGB values in the Color
Table.[1] So I declared variant_to_nscolor(from htmlbody.c) in
mshtml_private.h

[1]: http://msdn.microsoft.com/en-us/library/aa741715%28v=vs.85%29.aspx

---
  dlls/mshtml/htmlbody.c       |  4 ++--
  dlls/mshtml/htmltablerow.c   | 41 
+++++++++++++++++++++++++++++++++++++----
  dlls/mshtml/mshtml_private.h |  4 ++++
  dlls/mshtml/tests/dom.c      | 35 +++++++++++++++++++++++++++++++++++
  4 files changed, 78 insertions(+), 6 deletions(-)


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