Unify geometry test printers in a test support target.

Source/platform/blink_platform_tests.gyp

Index: Source/platform/blink_platform_tests.gyp
diff --git a/Source/platform/blink_platform_tests.gyp b/Source/platform/blink_platform_tests.gyp
index f93fd8ef9078626f6e71ccb9ac01a0e12dde7554..b92a9fae4699d37b5f68a04695304bb3a4c524bb 100644
--- a/Source/platform/blink_platform_tests.gyp
+++ b/Source/platform/blink_platform_tests.gyp
@@ -77,6 +77,7 @@
       'target_name': 'blink_platform_unittests',
       'type': 'executable',
       'dependencies': [
+        'blink_platform_test_support',
         '../config.gyp:unittest_config',
         '../wtf/wtf.gyp:wtf',
         '../wtf/wtf_tests.gyp:wtf_unittest_helpers',
@@ -113,6 +114,20 @@
         }],
       ],
     },
+    {
+      'target_name': 'blink_platform_test_support',
+      'type': 'static_library',
+      'dependencies': [
+        '../config.gyp:config',
+        'blink_platform.gyp:blink_platform',
+      ],
+      'defines': [
+        'INSIDE_BLINK',
+      ],
+      'sources': [
+        '<@(platform_test_support_files)',
+      ],
+    },
   ],
   'conditions': [
     ['OS=="android" and gtest_target_type == "shared_library"', {