Add a new API to create a surfaceless GLSurface for Ozone

ui/ozone/platform/dri/dri_vsync_provider.cc

Index: ui/ozone/platform/dri/dri_vsync_provider.cc
diff --git a/ui/ozone/platform/dri/dri_vsync_provider.cc b/ui/ozone/platform/dri/dri_vsync_provider.cc
index bf88c5d94ded27d4f06d67feb51905effa016e0a..2797dc9cec46a2a2f38259023df8cb3e0eb9e315 100644
--- a/ui/ozone/platform/dri/dri_vsync_provider.cc
+++ b/ui/ozone/platform/dri/dri_vsync_provider.cc
@@ -23,8 +23,11 @@ void DriVSyncProvider::GetVSyncParameters(const UpdateVSyncCallback& callback) {
 
   // The value is invalid, so we can't update the parameters.
   if (controller->GetTimeOfLastFlip() == 0 ||
-      controller->get_mode().vrefresh == 0)
+      controller->get_mode().vrefresh == 0) {
+    callback.Run(base::TimeTicks(),

[dnicoara, 2015/02/23 22:48:26]

Why do you need this?

[achaulk, 2015/02/23 22:50:17]

Dropping the callback causes a deadlock

[dnicoara, 2015/02/24 16:46:53]

We should look into what's causing the deadlock. The VSyncProvider does not
guarantee that this is called in every scenario.

+                 base::TimeDelta::FromSecondsD(1.0f / 60.0f));
     return;
+  }
 
   // Stores the time of the last refresh.
   base::TimeTicks timebase =