TextureImageTransport: Skip swaps without backbuffer.

Because of the descheduling logic, this should really only be possible
for consecutive Swaps without any drawing in between.

BUG=170094


Review URL: https://chromiumcodereview.appspot.com/12022007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@177841 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 10 insertions, 0 deletions

diff --git a/content/common/gpu/texture_image_transport_surface.cc b/content/common/gpu/texture_image_transport_surface.cc
index 5bcec62..2d7c2d0 100644
--- a/content/common/gpu/texture_image_transport_surface.cc
+++ b/content/common/gpu/texture_image_transport_surface.cc
@@ -207,6 +207,11 @@ bool TextureImageTransportSurface::SwapBuffers() {
   if (!frontbuffer_suggested_allocation_)
     return true;
 
+  if (!backbuffer_.service_id) {
+    LOG(ERROR) << "Swap without valid backing.";
+    return true;
+  }
+
   DCHECK(backbuffer_.size == current_size_);
   GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params params;
   params.size = backbuffer_.size;
@@ -240,6 +245,11 @@ bool TextureImageTransportSurface::PostSubBuffer(
   if (new_damage_rect.IsEmpty())
     return true;
 
+  if (!backbuffer_.service_id) {
+    LOG(ERROR) << "Swap without valid backing.";
+    return true;
+  }
+
   DCHECK(current_size_ == backbuffer_.size);
   GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params params;
   params.surface_size = backbuffer_.size;