Add initial Viz implementation for OSR (see issue #2575).

The old shared surface implementation has been removed and will need to be
re-implemented using the Viz code path.

patch/patch.cfg

@@ -383,11 +383,6 @@ patches = [
     # https://bitbucket.org/chromiumembedded/cef/issues/2540
     'name': 'mac_fling_scheduler_2540',
   },
-  {
-    # Support rendering to a hardware GL/D3D texture/surface provided by the client
-    # https://bitbucket.org/chromiumembedded/cef/issues/1006
-    'name': 'external_textures_1006',
-  },
   {
     # Linux: Use poll instead of select to fix crash during startup.
     # https://bitbucket.org/chromiumembedded/cef/issues/2466
@@ -460,5 +455,10 @@ patches = [
     # Shutdown for all Profiles before local_state deletion.
     # This crash was introduced by https://crrev.com/7d032b378c.
     'name': 'chrome_pref_watcher',
-    }
+  },
+  {
+    # Add support for OSR rendering with Viz.
+    # https://bitbucket.org/chromiumembedded/cef/issues/2575
+    'name': 'viz_osr_2575',
+  }
 ]