Add in boost_tuple into third-party for use by googlemock in windows.

third_party/boost/README.chromium

Index: third_party/boost/README.chromium
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+This contains a stripped down version of TR1::Boost version 1.36.0.  It
+contains only the files required to use tr1::tuple in Visual Studio 2005.
+All other files have been removed.  The original packing of Boost tuple used
+to create this version was taken from the googlemock project download page:
+
+  http://googlemock.googlecode.com/files/boost_tr1_tuple_1_36_0.zip
+
+This code is released under the Boost Software License - Version 1.0.  See
+boost_1_36_0/LICENSE_1_0.txt for details.
+
+Steps to reproduce stripped down package:
+  1) Download from
+     http://googlemock.googlecode.com/files/boost_tr1_tuple_1_36_0.zip
+  2) Unzip the package.  This will create the boost_1_36_0 directory.
+  3) Create a .cpp file with one line:
+       #include <tuple>
+  4) Run this file through the Visual C++ preprocessor, making sure that the
+     same compiler options (/I, /D, etc) are the same as for the the rest
+     project, and that #{BOOST_ROOT}/boost/tr1/tr1;${BOOST_ROOT} are added
+     to the include path path.  To get the preprocess output in Visual Studio,
+     select the .cpp file, go to Properties | C/C++ | Preprocessor, and set
+     "Generate Preprocessed File" to Yes.
+ *5) In the preprocessed file, find all header files referenced in the
+     boost_1_36_0 subdirectory.
+  6) For each file in the boost_1_36_0 directory, if it is not referenced in
+     the list produced in step 5, delete it.
+
+The result should be 389 files, at about 2.4 megs. Adding in the
+LICENSE_1_0.txt file brings the distribution to an even 390 files.
+
+In comparison the full expansion of boost_tr1_tuple_1_36_0.zip is 1097 files
+using 9.2 megs.
+
+* For step 5, the following bash line helps generate a list of files:
+
+    cat file.i | grep "^#line" | grep boost_1_36_0 | \
+        tr -s ' ' | cut -d ' ' -f3 | tr -d \" | sort -u