Re-add snap-back behavior (Chrome side)

content/content_renderer.gypi

Index: content/content_renderer.gypi
===================================================================
--- content/content_renderer.gypi	(revision 252686)
+++ content/content_renderer.gypi	(working copy)
@@ -531,6 +531,10 @@
     'renderer/webgraphicscontext3d_provider_impl.h',
     'renderer/webpublicsuffixlist_impl.cc',
     'renderer/webpublicsuffixlist_impl.h',
+    'renderer/webscrollbarbehavior_impl_gtkoraura.cc',
+    'renderer/webscrollbarbehavior_impl_gtkoraura.h',
+    'renderer/webscrollbarbehavior_impl_mac.mm',
+    'renderer/webscrollbarbehavior_impl_mac.h',
     'renderer/websharedworker_proxy.cc',
     'renderer/websharedworker_proxy.h',
   ],
@@ -555,7 +559,14 @@
     ['OS=="mac"', {
       'sources!': [
         'common/process_watcher_posix.cc',
+        'renderer/webscrollbarbehavior_impl_gtkoraura.cc',
+        'renderer/webscrollbarbehavior_impl_gtkoraura.h',

[Avi (use Gerrit), 2014/02/25 03:44:31]

Huh. Do we do this anywhere else? Kind of a bummer that we have to do this for
GTK which is going away soon.

[Peter Kasting, 2014/02/25 06:10:02]

What specific thing are you referring to when you say "this"?

I could put everything in one file with ifdefs, but separating the Mac
implementation out seemed cleaner since it was different enough from the other
two.  I don't really have a strong feeling for how I should have split the code,
named the filed, or structured the .gypi changes, though; I was mostly aiming
for something that worked, and I was somewhat inspired by the "Mac" vs.
"GTKorAura" split in the ScrollbarTheme code over in Blink.

       ],
+    }, {
+      'sources!': [
+        'renderer/webscrollbarbehavior_impl_mac.mm',
+        'renderer/webscrollbarbehavior_impl_mac.h',
+      ],
     }],
     ['OS=="win" and win_use_allocator_shim==1', {
       'dependencies': [