Force buffer re-allocation when the backing display changes

ui/ozone/platform/drm/gpu/drm_surface.cc

Index: ui/ozone/platform/drm/gpu/drm_surface.cc
diff --git a/ui/ozone/platform/drm/gpu/drm_surface.cc b/ui/ozone/platform/drm/gpu/drm_surface.cc
index f3780ff1ffe3a35cca39e33f0004d6a11f04aae9..bb606d3786e977dbe5747e3c5453bd850b041974 100644
--- a/ui/ozone/platform/drm/gpu/drm_surface.cc
+++ b/ui/ozone/platform/drm/gpu/drm_surface.cc
@@ -99,9 +99,12 @@ void DrmSurface::SchedulePageFlip() {
 
   // Update our front buffer pointer.
   std::swap(front_buffer_, back_buffer_);
-  pending_pageflip_ = window_->SchedulePageFlip(
-      false /* is_sync */,
-      base::Bind(&DrmSurface::OnPageFlip, weak_ptr_factory_.GetWeakPtr()));
+  pending_pageflip_ = true;

[alexst (slow to review), 2015/09/08 21:12:53]

Please make a quick note that this is a re-entrance issue.

[dnicoara, 2015/09/09 14:09:52]

Done.

+  if (!window_->SchedulePageFlip(false /* is_sync */,
+                                 base::Bind(&DrmSurface::OnPageFlip,
+                                            weak_ptr_factory_.GetWeakPtr()))) {
+    pending_pageflip_ = false;
+  }
 }
 
 void DrmSurface::OnPageFlip(gfx::SwapResult result) {