Adds a TransportDIB::Id value that is explicitly invalid and use it when compositing

content/renderer/pepper_plugin_delegate_impl.cc

Index: content/renderer/pepper_plugin_delegate_impl.cc
diff --git a/content/renderer/pepper_plugin_delegate_impl.cc b/content/renderer/pepper_plugin_delegate_impl.cc
index e4ccc962b70762ed0fd5116fc6758a063a1173d2..c5f50e85f695d983f3b6fd288553d054ffd506a7 100644
--- a/content/renderer/pepper_plugin_delegate_impl.cc
+++ b/content/renderer/pepper_plugin_delegate_impl.cc
@@ -564,7 +564,7 @@ PepperPluginDelegateImpl::CreateImage2D(int width, int height) {
                                                         &dib_handle);
   if (!RenderThread::current()->Send(msg))
     return NULL;
-  if (!TransportDIB::is_valid(dib_handle))
+  if (!TransportDIB::is_valid_handle(dib_handle))
     return NULL;
 
   TransportDIB* dib = TransportDIB::Map(dib_handle);