From 2e3b0912f5726ddcccd0844b67891adc50fd4226 Mon Sep 17 00:00:00 2001
From: Kartikaya Gupta <kgupta@mozilla.com>
Date: Tue, 31 Mar 2015 08:50:14 -0400
Subject: [PATCH] Bug 1145295 - Add some debug logging to try and trace an
 intermittent assertion. r=nical

---
 gfx/layers/ipc/CompositorParent.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gfx/layers/ipc/CompositorParent.cpp b/gfx/layers/ipc/CompositorParent.cpp
index 9b1e600c8f2c..0d97f1936197 100644
--- a/gfx/layers/ipc/CompositorParent.cpp
+++ b/gfx/layers/ipc/CompositorParent.cpp
@@ -1121,6 +1121,14 @@ CompositorParent::ShadowLayersUpdated(LayerTransactionParent* aLayerTree,
         mRootLayerTreeID, aPaintSequenceNumber);
   }
 
+#ifdef DEBUG
+  if (aTransactionId <= mPendingTransaction) {
+    // Logging added to help diagnose why we're triggering the assert below.
+    // See bug 1145295
+    printf_stderr("CRASH: aTransactionId %" PRIu64 " <= mPendingTransaction %" PRIu64 "\n",
+      aTransactionId, mPendingTransaction);
+  }
+#endif
   MOZ_ASSERT(aTransactionId > mPendingTransaction);
   mPendingTransaction = aTransactionId;