Unify geometry test printers in a test support target.

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 1003 matching lines @@
       'graphics/ImageFrameGeneratorTest.cpp',
       'graphics/ImageLayerChromiumTest.cpp',
       'graphics/test/MockImageDecoder.h',
       'graphics/test/MockWebGraphicsContext3D.h',
       'image-decoders/ImageDecoderTestHelpers.cpp',
       'image-decoders/bmp/BMPImageDecoderTest.cpp',
       'image-decoders/gif/GIFImageDecoderTest.cpp',
       'image-decoders/jpeg/JPEGImageDecoderTest.cpp',
       'image-decoders/webp/WEBPImageDecoderTest.cpp',
     ],
+    # TODO(jbroman): Move these into platform_test_support_files.
     'platform_unittest_support_files': [
       'testing/URLTestHelpers.cpp',
       'testing/URLTestHelpers.h',
       'testing/UnitTestHelpers.cpp',
       'testing/UnitTestHelpers.h',
     ],
+    'platform_test_support_files': [
+      'testing/GeometryPrinters.cpp',
+      'testing/GeometryPrinters.h',
+    ],
     'conditions': [
       ['OS=="win"',
         {
           'platform_test_files': [
             'text/LocaleWinTest.cpp',
           ],
         }
       ],
       ['OS=="mac"',
         {
           'platform_test_files': [
             'text/LocaleMacTest.cpp',
           ]
         }
       ],
       ['os_posix==1 and OS!="mac"',
         {
           'platform_test_files': [
             'text/LocaleICUTest.cpp',
           ],
         }
       ],
     ],
   },
 }