Add more CHECK in GPU and NPAPI process on invalid file descriptors

content/common/gpu/gpu_channel.cc

Index: content/common/gpu/gpu_channel.cc
diff --git a/content/common/gpu/gpu_channel.cc b/content/common/gpu/gpu_channel.cc
index 27eb490fc6b069c01f3b7312aa693073e875c514..a016c58acdad948723bb9592c41d09e0da014f6b 100644
--- a/content/common/gpu/gpu_channel.cc
+++ b/content/common/gpu/gpu_channel.cc
@@ -417,8 +417,11 @@ void GpuChannel::OnCloseChannel() {
 bool GpuChannel::Init(base::MessageLoopProxy* io_message_loop,
                       base::WaitableEvent* shutdown_event) {
   // Check whether we're already initialized.
-  if (channel_.get())
+  if (channel_.get()) {
+    // TODO(xhwang): Added to investigate crbug.com/95732. Clean up after fixed.
+    CHECK(false);
     return true;
+  }
 
   // Map renderer ID to a (single) channel to that process.
   std::string channel_name = GetChannelName();