Add UMA histogram to track the various sources that request the feedback app

chrome/browser/chromeos/arc/arc_session_manager.cc

 // Copyright 2016 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/chromeos/arc/arc_session_manager.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 986 matching lines @@
   } else {
     // Otherwise, we restart ARC. Note: this is the first boot case.
     // For second or later boot, either ERROR_WITH_FEEDBACK case or ACTIVE
     // case must hit.
     StartAndroidManagementCheck();
   }
 }
 
 void ArcSessionManager::OnSendFeedbackClicked() {
   DCHECK(support_host_);
-  chrome::OpenFeedbackDialog(nullptr);
+  chrome::OpenFeedbackDialog(nullptr, chrome::kFeedbackSourceArcApp);
 }
 
 void ArcSessionManager::SetArcSessionRunnerForTesting(
     std::unique_ptr<ArcSessionRunner> arc_session_runner) {
   DCHECK(arc_session_runner);
   DCHECK(arc_session_runner_);
   DCHECK(arc_session_runner_->IsStopped());
   arc_session_runner_->RemoveObserver(this);
   arc_session_runner_ = std::move(arc_session_runner);
   arc_session_runner_->AddObserver(this);
@@ skipping 31 matching lines @@
 
 #undef MAP_STATE
 
   // Some compilers report an error even if all values of an enum-class are
   // covered exhaustively in a switch statement.
   NOTREACHED() << "Invalid value " << static_cast<int>(state);
   return os;
 }
 
 }  // namespace arc