Set VizDisplayCompositor feature enabled on desktop platforms.

In preparation for launching OOP-D on stable switch the
VizDisplayCompositor feature from disabled to enabled by default. This
is following with the finch best practices.

OOP-D is still disabled by default on Android and Chrome OS. Android
should get switched over shortly after fixing a few failing tests.
Chrome OS isn't ready to launch yet.

Bug: 730193
Change-Id: I6f55d40492291321d13925dd685181bdfda9f3d2
Reviewed-on: https://chromium-review.googlesource.com/c/1361930
Reviewed-by: Saman Sami <samans@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613979}
diff --git a/components/viz/common/features.cc b/components/viz/common/features.cc
index 45ada21..edb4054 100644
--- a/components/viz/common/features.cc
+++ b/components/viz/common/features.cc
@@ -26,8 +26,13 @@
 // Enables running the display compositor as part of the viz service in the GPU
 // process. This is also referred to as out-of-process display compositor
 // (OOP-D).
+#if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 const base::Feature kVizDisplayCompositor{"VizDisplayCompositor",
                                           base::FEATURE_DISABLED_BY_DEFAULT};
+#else
+const base::Feature kVizDisplayCompositor{"VizDisplayCompositor",
+                                          base::FEATURE_ENABLED_BY_DEFAULT};
+#endif
 
 // Enables running the Viz-assisted hit-test logic.
 #if defined(OS_CHROMEOS)