test_shell buildable on ARM

GYP changes to allow test_shell be buildable on ARM so we can
use it as a minimal browser for testing purpopse.

Review URL: http://codereview.chromium.org/399077

git-svn-id: http://src.chromium.org/svn/trunk/src/build@32386 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -725,8 +725,8 @@
             # flag.
             'cflags!': [ '-fvisibility=hidden' ],
             'conditions': [
-              ['target_arch=="x64"', {
-                # Shared libraries need -fPIC on x86-64
+              ['target_arch=="x64" or target_arch=="arm"', {
+                # Shared libraries need -fPIC on x86-64 and arm
                 'cflags': ['-fPIC']
               }]
             ],