Add helper class for tests using browser process hit testing

content/test/content_browser_test_utils_internal.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_TEST_CONTENT_BROWSER_TEST_UTILS_INTERNAL_H_
 #define CONTENT_TEST_CONTENT_BROWSER_TEST_UTILS_INTERNAL_H_
 
 // A collection of functions designed for use with content_shell based browser
 // tests internal to the content/ module.
 // Note: If a function here also works with browser_tests, it should be in
 // the content public API.
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
+#include "cc/surfaces/surface_id.h"
 #include "content/public/browser/resource_dispatcher_host_delegate.h"
 #include "url/gurl.h"
 
+namespace cc {
+class SurfaceManager;
+}
+
 namespace content {
 
 class FrameTreeNode;
+class RenderWidgetHostViewChildFrame;
 class Shell;
 class SiteInstance;
 class ToRenderFrameHost;
 
 // Navigates the frame represented by |node| to |url|, blocking until the
 // navigation finishes.
 void NavigateFrameToURL(FrameTreeNode* node, const GURL& url);
 
 // Creates compact textual representations of the state of the frame tree that
 // is appropriate for use in assertions.
@@ skipping 57 matching lines @@
   void RequestBeginning(
       net::URLRequest* request,
       content::ResourceContext* resource_context,
       content::AppCacheService* appcache_service,
       ResourceType resource_type,
       ScopedVector<content::ResourceThrottle>* throttles) override;
 
   GURL url_;
 };
 
+// Helper class to assist with hit testing surfaces in multiple processes.
+// WaitForSurfaceReady() will only return after a Surface from |target_view|
+// has been composited in the top-level frame's Surface. At that point,
+// browser process hit testing to target_view's Surface can succeed.
+class SurfaceHitTestReadyNotifier {
+ public:
+  SurfaceHitTestReadyNotifier(RenderWidgetHostViewChildFrame* target_view);
+  ~SurfaceHitTestReadyNotifier() {}
+
+  void WaitForSurfaceReady();
+
+ private:
+  bool ContainsSurfaceId();
+
+  cc::SurfaceManager* surface_manager_;
+  cc::SurfaceId root_surface_id_;
+  RenderWidgetHostViewChildFrame* target_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(SurfaceHitTestReadyNotifier);
+};
+
 }  // namespace content
 
 #endif  // CONTENT_TEST_CONTENT_BROWSER_TEST_UTILS_INTERNAL_H_