Rename PrepareAction to more make obvious what it does.  Change the conversion of / to \ to handle the case where command line arguments starts with a forward slash.  This can be the case for some of the Microsoft tools.  Fixed path of the gyp file added to the sources so that a relative path is used, which leads to better navigation.
Rename PrepareAction to more make obvious what it does.  Change the conversion of / to \ to handle the case where command line arguments starts with a forward slash.  This can be the case for some of the Microsoft tools.  Fixed path of the gyp file added to the sources so that a relative path is used, which leads to better navigation.

BUG=96
Review URL: http://codereview.chromium.org/6652012
witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp