Add an histogram to differentiate between hang types of the renderer

content/browser/devtools/devtools_manager_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 "content/browser/devtools/devtools_manager.h"
 
 #include <memory>
 
 #include "base/location.h"
 #include "base/macros.h"
@@ skipping 127 matching lines @@
   TestWebContentsDelegate delegate;
   contents()->SetDelegate(&delegate);
 
   TestDevToolsClientHost client_host;
   scoped_refptr<DevToolsAgentHost> agent_host(DevToolsAgentHost::GetOrCreateFor(
       WebContents::FromRenderViewHost(inspected_rvh)));
   client_host.InspectAgentHost(agent_host.get());
 
   // Start with a short timeout.
   inspected_rvh->GetWidget()->StartHangMonitorTimeout(
-      TimeDelta::FromMilliseconds(10));
+      TimeDelta::FromMilliseconds(10),
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_UNKNOWN);
   // Wait long enough for first timeout and see if it fired.
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, base::MessageLoop::QuitWhenIdleClosure(),
       TimeDelta::FromMilliseconds(10));
   base::RunLoop().Run();
   EXPECT_FALSE(delegate.renderer_unresponsive_received());
 
   // Now close devtools and check that the notification is delivered.
   client_host.Close();
   // Start with a short timeout.
   inspected_rvh->GetWidget()->StartHangMonitorTimeout(
-      TimeDelta::FromMilliseconds(10));
+      TimeDelta::FromMilliseconds(10),
+      RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_UNKNOWN);
   // Wait long enough for first timeout and see if it fired.
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, base::MessageLoop::QuitWhenIdleClosure(),
       TimeDelta::FromMilliseconds(10));
   base::RunLoop().Run();
   EXPECT_TRUE(delegate.renderer_unresponsive_received());
 
   contents()->SetDelegate(NULL);
 }
 
@@ skipping 78 matching lines @@
   TestDevToolsClientHost client_host;
   client_host.InspectAgentHost(agent_host.get());
   agent_host->DispatchProtocolMessage(&client_host, "message1");
   agent_host->DispatchProtocolMessage(&client_host, "message2");
   agent_host->DispatchProtocolMessage(&client_host, "message2");
 
   client_host.Close();
 }
 
 }  // namespace content