Print full path in diagnostic messages building with ninja on windows.
Print full path in diagnostic messages building with ninja on windows.

This allows to click on messages in visual studio to open file with error or warning.
By default all path is relative to src/out/Debug but visual studio search file relative to location project.

Putting project into deeper directory to match default relative path is an option, but in this case you can't use 'Show All Files' in solution explorer to browse source tree.

BUG=none
TEST=none
Review URL: https://chromiumcodereview.appspot.com/10537170
witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp