Use mojo for Chrome Loading, Part 1

content/browser/loader/resource_message_filter.cc

Index: content/browser/loader/resource_message_filter.cc
diff --git a/content/browser/loader/resource_message_filter.cc b/content/browser/loader/resource_message_filter.cc
index 186bf66316ef0ebe2a3f3df44d01520e9d2146bd..3e0613108d1f0fac0d4748eedc89cbe89364187d 100644
--- a/content/browser/loader/resource_message_filter.cc
+++ b/content/browser/loader/resource_message_filter.cc
@@ -64,7 +64,35 @@ const HostZoomMap* ResourceMessageFilter::GetHostZoomMap() const {
   return NULL;
 }
 
+bool ResourceMessageFilter::Send(IPC::Message* message) {
+  if (message->is_sync()) {
+    // We don't support sending synchronous messages from the browser.  If we
+    // really needed it, we can make this class derive from SyncMessageFilter
+    // but it seems better to not allow sending synchronous messages from the
+    // browser, since it might allow a corrupt/malicious renderer to hang us.
+    NOTREACHED() << "Can't send sync message through ResourceMessageFilter!";
+    return false;
+  }
+
+  if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(base::IgnoreResult(&ResourceMessageFilter::Send), this,
+                   message));
+    return true;
+  }
+
+  if (ResourceDispatcherHostImpl::Get()->SendWithMojoIfPossible(*message,
+                                                                this)) {
+    delete message;
+    return true;
+  }
+
+  return BrowserMessageFilter::Send(message);
+}
+
 base::WeakPtr<ResourceMessageFilter> ResourceMessageFilter::GetWeakPtr() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
   return weak_ptr_factory_.GetWeakPtr();
 }