Enable webgl conformance tests under content/test/gpu in content_browsertests

content/test/content_browser_test_utils.h

Index: content/test/content_browser_test_utils.h
diff --git a/content/test/content_browser_test_utils.h b/content/test/content_browser_test_utils.h
index 9ea40a5d542e7c4cf95416b650444534ad75bd55..e83af20b936826255b630616feb0798ee1c9a715 100644
--- a/content/test/content_browser_test_utils.h
+++ b/content/test/content_browser_test_utils.h
@@ -5,7 +5,13 @@
 #ifndef CONTENT_TEST_CONTENT_BROWSER_TEST_UTILS_H_
 #define CONTENT_TEST_CONTENT_BROWSER_TEST_UTILS_H_
 
+#include <queue>
+
 #include "base/memory/ref_counted.h"
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/notification_source.h"
 #include "googleurl/src/gurl.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ -69,6 +75,37 @@ class ShellAddedObserver {
   DISALLOW_COPY_AND_ASSIGN(ShellAddedObserver);
 };
 
+// Watches for responses from the DOMAutomationController and keeps them in a
+// queue. Useful for waiting for a message to be received.
+class DOMMessageQueue : public content::NotificationObserver {
+ public:
+  // Constructs a DOMMessageQueue and begins listening for messages from the
+  // DOMAutomationController. Do not construct this until the browser has
+  // started.
+  DOMMessageQueue();
+  virtual ~DOMMessageQueue();
+
+  // Removes all messages in the message queue.
+  void ClearQueue();
+
+  // Wait for the next message to arrive. |message| will be set to the next
+  // message, if not null. Returns true on success.
+  bool WaitForMessage(std::string* message) WARN_UNUSED_RESULT;
+
+  // Overridden content::NotificationObserver methods.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+ private:
+  content::NotificationRegistrar registrar_;
+  std::queue<std::string> message_queue_;
+  bool waiting_for_message_;
+  scoped_refptr<content::MessageLoopRunner> message_loop_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(DOMMessageQueue);
+};
+
 #if defined OS_MACOSX
 void SetWindowBounds(gfx::NativeWindow window, const gfx::Rect& bounds);
 #endif