Fix scrollbar buttons at hidpi when enable-use-zoom-for-dsf is on.

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 1301 matching lines @@
         {
           'platform_test_files': [
             'text/LocaleICUTest.cpp',
           ],
         }
       ],
       ['OS!="mac"',
         {
           'platform_test_files': [
             'scroll/ScrollAnimatorTest.cpp',
+            'scroll/ScrollbarThemeAuraTest.cpp',

[jbroman, 2016/05/11 21:24:08]

similarly, this should be guarded by use_default_render_theme==1

[Bret, 2016/05/12 00:18:12]

Done.

           ],
         }
       ],
     ],
   },
 }