Create manager to track OffscreenCanvasSurfaceImpl instances

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

Index: third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp b/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp
index efb3d283d6114cdc0670bbf4a9ff828e2b0299f4..76aefdb27d3ca9ae691999632b56d52f33c92efe 100644
--- a/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp
+++ b/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp
@@ -25,6 +25,7 @@
 namespace blink {
 
 OffscreenCanvasFrameDispatcherImpl::OffscreenCanvasFrameDispatcherImpl(
+    int canvasId,
     uint32_t clientId,
     uint32_t sinkId,
     uint32_t localId,
@@ -41,7 +42,7 @@ OffscreenCanvasFrameDispatcherImpl::OffscreenCanvasFrameDispatcherImpl(
   mojom::blink::OffscreenCanvasCompositorFrameSinkProviderPtr provider;
   Platform::current()->interfaceProvider()->getInterface(
       mojo::GetProxy(&provider));
-  provider->CreateCompositorFrameSink(m_surfaceId,
+  provider->CreateCompositorFrameSink(canvasId, m_surfaceId,
                                       m_binding.CreateInterfacePtrAndBind(),
                                       mojo::GetProxy(&m_sink));
 }