Initial Gears SConscript file. A bit messy. Only builds chrome+dbg and

IE+dbg configurations.
Review URL: http://codereview.chromium.org/232

git-svn-id: http://src.chromium.org/svn/trunk/src/build@2269 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

SConscript.main

@@ -465,6 +465,9 @@ if LoadComponent('breakpad'):
 if LoadComponent('chrome'):
   sconscripts.append('$CHROME_DIR/SConscript')
 
+if LoadComponent('gears'):
+  sconscripts.append('$GEARS_DIR/SConscript')
+
 if LoadComponent('google_update'):
   sconscripts.append('$GOOGLE_UPDATE_DIR/SConscript')