cc: Unify context losing machinery

cc/thread_proxy.cc

Index: cc/thread_proxy.cc
diff --git a/cc/thread_proxy.cc b/cc/thread_proxy.cc
index d3aac84f1d7b01ea1446ccf4ae73a9898f8d0533..921b15a1f1f8191a5da930a89ec213ff1a5cbfea 100644
--- a/cc/thread_proxy.cc
+++ b/cc/thread_proxy.cc
@@ -300,6 +300,15 @@ void ThreadProxy::didLoseOutputSurfaceOnImplThread()
 {
     DCHECK(isImplThread());
     TRACE_EVENT0("cc", "ThreadProxy::didLoseOutputSurfaceOnImplThread");
+    Proxy::implThread()->postTask(base::Bind(&ThreadProxy::checkOutputSurfaceStatusOnImplThread, m_implThreadWeakPtr));
+}
+
+void ThreadProxy::checkOutputSurfaceStatusOnImplThread()
+{
+    DCHECK(isImplThread());
+    TRACE_EVENT0("cc", "ThreadProxy::checkOutputSurfaceStatusOnImplThread");
+    if (!m_layerTreeHostImpl->isContextLost())
+        return;
     m_schedulerOnImplThread->didLoseOutputSurface();
 }
 
@@ -842,6 +851,9 @@ ScheduledActionDrawAndSwapResult ThreadProxy::scheduledActionDrawAndSwapInternal
         Proxy::mainThread()->postTask(base::Bind(&ThreadProxy::didCommitAndDrawFrame, m_mainThreadWeakPtr));
     }
 
+    if (drawFrame)
+        checkOutputSurfaceStatusOnImplThread();
+
     return result;
 }