ozone: dri: add synchronous SwapBuffers support on surfaceless

ui/ozone/platform/dri/hardware_display_controller.cc

Index: ui/ozone/platform/dri/hardware_display_controller.cc
diff --git a/ui/ozone/platform/dri/hardware_display_controller.cc b/ui/ozone/platform/dri/hardware_display_controller.cc
index 0bd49477e857fcabbd05c7c4a4ec1a41bf88c5dc..807c5f93b0c0f22d81f330075cd14c9401e3a092 100644
--- a/ui/ozone/platform/dri/hardware_display_controller.cc
+++ b/ui/ozone/platform/dri/hardware_display_controller.cc
@@ -89,6 +89,7 @@ void HardwareDisplayController::QueueOverlayPlane(const OverlayPlane& plane) {
 }
 
 bool HardwareDisplayController::SchedulePageFlip(
+    bool is_sync,
     const base::Closure& callback) {
   TRACE_EVENT0("dri", "HDC::SchedulePageFlip");
 
@@ -105,7 +106,7 @@ bool HardwareDisplayController::SchedulePageFlip(
   if (HasPendingPageFlips())
     return true;
 
-  bool status = ActualSchedulePageFlip();
+  bool status = ActualSchedulePageFlip(is_sync);
 
   // No page flip event on failure so discard failed request.
   if (!status)
@@ -246,7 +247,7 @@ void HardwareDisplayController::OnPageFlipEvent() {
     return;
 
   // At this point we still have requests pending, so schedule the next request.
-  bool status = ActualSchedulePageFlip();
+  bool status = ActualSchedulePageFlip(false);

[dnicoara, 2015/02/26 22:16:29]

Then |is_sync| will be taken from the PageFlipRequest.

[llandwerlin-old, 2015/02/27 10:56:47]

Done, thanks a lot.

   if (!status) {
     PageFlipRequest request = requests_.front();
     requests_.pop_front();
@@ -274,7 +275,7 @@ bool HardwareDisplayController::HasPendingPageFlips() const {
   return false;
 }
 
-bool HardwareDisplayController::ActualSchedulePageFlip() {
+bool HardwareDisplayController::ActualSchedulePageFlip(bool is_sync) {
   TRACE_EVENT0("dri", "HDC::ActualSchedulePageFlip");
   DCHECK(!requests_.empty());
 
@@ -297,7 +298,7 @@ bool HardwareDisplayController::ActualSchedulePageFlip() {
   }
 
   for (const auto& planes : owned_hardware_planes_) {
-    if (!planes.first->plane_manager()->Commit(planes.second)) {
+    if (!planes.first->plane_manager()->Commit(planes.second, is_sync)) {
       status = false;
     }
   }