Ignore calls to SatisfySequence if CanvasSurfaceLayerBridge is gone

third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.cpp

Index: third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.cpp b/third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.cpp
index 02c63f865374ab1faae6fc7074fc11be8e81bad9..961d72829ed9aff481ceb4b2000ce1f2b55a6443 100644
--- a/third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.cpp
+++ b/third_party/WebKit/Source/platform/graphics/CanvasSurfaceLayerBridge.cpp
@@ -44,8 +44,8 @@ class OffscreenCanvasSurfaceReferenceFactory
   }
 
   void SatisfySequence(const cc::SurfaceSequence& sequence) const override {
-    DCHECK(bridge_);
-    bridge_->SatisfyCallback(sequence);
+    if (bridge_)
+      bridge_->SatisfyCallback(sequence);

[Fady Samuel, 2017/05/26 20:47:57]

maybe do this for require too?

[Saman Sami, 2017/05/29 17:48:22]

I expect bridge_ to exist in RequireSequence. SatisfySequence is PostTasked so
lifetimes get messed up.

   }
 
   base::WeakPtr<CanvasSurfaceLayerBridge> bridge_;