Use an X event loop in the GPU process on Linux.

chrome/browser/custom_handlers/protocol_handler_registry_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 
 #include <set>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 268 matching lines @@
 // to harness our tests so all threads use the same loop allowing us to
 // guarantee all messages are processed.) By overriding the IsType method
 // we basically ignore the supplied message loop type, and instead infer
 // our type based on the current thread. GO DEPENDENCY INJECTION!
 class TestMessageLoop : public base::MessageLoop {
  public:
   TestMessageLoop() : base::MessageLoop(base::MessageLoop::TYPE_DEFAULT) {}
   virtual ~TestMessageLoop() {}
   virtual bool IsType(base::MessageLoop::Type type) const OVERRIDE {
     switch (type) {
+#if defined(TOOLKIT_GTK)
+      case base::MessageLoop::TYPE_GPU:
+#endif
       case base::MessageLoop::TYPE_UI:
         return BrowserThread::CurrentlyOn(BrowserThread::UI);
       case base::MessageLoop::TYPE_IO:
         return BrowserThread::CurrentlyOn(BrowserThread::IO);
 #if defined(OS_ANDROID)
       case base::MessageLoop::TYPE_JAVA: // fall-through
 #endif // defined(OS_ANDROID)
       case base::MessageLoop::TYPE_DEFAULT:
         return !BrowserThread::CurrentlyOn(BrowserThread::UI) &&
                !BrowserThread::CurrentlyOn(BrowserThread::IO);
@@ skipping 620 matching lines @@
 
 TEST_F(ProtocolHandlerRegistryTest, MAYBE_TestInstallDefaultHandler) {
   RecreateRegistry(false);
   registry()->AddPredefinedHandler(CreateProtocolHandler(
       "test", GURL("http://test.com/%s"), "Test"));
   registry()->InitProtocolSettings();
   std::vector<std::string> protocols;
   registry()->GetRegisteredProtocols(&protocols);
   ASSERT_EQ(static_cast<size_t>(1), protocols.size());
 }