android webview: allow cc to fail hardware draw

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index cc87ba28ba18d1c841e7cf50127be653c521003b..59d8868ab4b730c7a24f235b9903fbab0678e2d4 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -366,6 +366,12 @@ void ThreadProxy::WillBeginImplFrame(const BeginFrameArgs& args) {
   }
 }
 
+void ThreadProxy::OnResourcelessSoftareDrawStateChanged(
+    bool resourceless_draw) {
+  DCHECK(IsImplThread());
+  impl().scheduler->SetResourcelessSoftareDraw(resourceless_draw);
+}
+
 void ThreadProxy::OnCanDrawStateChanged(bool can_draw) {
   TRACE_EVENT1(
       "cc", "ThreadProxy::OnCanDrawStateChanged", "can_draw", can_draw);