Show more symbols on profiling builds (flutter-tizen#104)

* Show more symbols on profiling builds

* Remove libdart dependency

* Add libdart dependency for builds with enabled profiling

* Fix shell/platform/tizen/BUILD.gn formatting

* Remove dependency on libdart

* Remove unnecessary import

Author: pwasowski2

tools/gn

@@ -283,7 +283,7 @@ def to_gn_args(args):
 
     # We should not need a special case for x86, but this seems to introduce text relocations
     # even with -fPIC everywhere.
-    # gn_args['enable_profiling'] = args.runtime_mode != 'release' and args.android_cpu != 'x86'
+    gn_args['enable_profiling'] = args.runtime_mode != 'release' and args.android_cpu != 'x86'
 
     if args.arm_float_abi:
       gn_args['arm_float_abi'] = args.arm_float_abi