Add UMA for studying download cancellation reasons

content/browser/android/download_controller_android_impl.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/android/download_controller_android_impl.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
 #include "content/browser/android/content_view_core_impl.h"
 #include "content/browser/android/deferred_download_observer.h"
 #include "content/browser/download/download_item_impl.h"
 #include "content/browser/download/download_manager_impl.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_delegate.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
@@ skipping 99 matching lines @@
                                       jboolean granted) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(callback_id);
 
   // Convert java long long int to c++ pointer, take ownership.
   std::unique_ptr<
       DownloadControllerAndroid::AcquireFileAccessPermissionCallback>
   cb(reinterpret_cast<
       DownloadControllerAndroid::AcquireFileAccessPermissionCallback*>(
       callback_id));
+  if (!granted) {
+    DownloadControllerAndroid::RecordDownloadCancelReason(
+        DownloadControllerAndroid::CANCEL_REASON_NO_STORAGE_PERMISSION);
+  }
   cb->Run(granted);
 }
 
 struct DownloadControllerAndroidImpl::JavaObject {
   ScopedJavaLocalRef<jobject> Controller(JNIEnv* env) {
     return GetRealObject(env, obj);
   }
   jweak obj;
 };
 
@@ skipping 11 matching lines @@
 }
 
 //static
 void DownloadControllerAndroid::SetDownloadControllerAndroid(
     DownloadControllerAndroid* download_controller) {
   base::AutoLock lock(g_download_controller_lock_.Get());
   DownloadControllerAndroid::download_controller_ = download_controller;
 }
 
 // static
+void DownloadControllerAndroid::RecordDownloadCancelReason(
+    DownloadCancelReason reason) {
+  UMA_HISTOGRAM_ENUMERATION(
+      "MobileDownload.CancelReason", reason, CANCEL_REASON_MAX);
+}
+
+// static
 DownloadControllerAndroidImpl* DownloadControllerAndroidImpl::GetInstance() {
   return base::Singleton<DownloadControllerAndroidImpl>::get();
 }
 
 DownloadControllerAndroidImpl::DownloadControllerAndroidImpl()
     : java_object_(NULL) {
 }
 
 DownloadControllerAndroidImpl::~DownloadControllerAndroidImpl() {
   if (java_object_) {
@@ skipping 312 matching lines @@
       // Multiple OnDownloadUpdated() notifications may be issued while the
       // download is in the COMPLETE state. Only handle one.
       item->RemoveObserver(this);
 
       // Call onDownloadCompleted
       Java_DownloadController_onDownloadCompleted(
           env, GetJavaObject()->Controller(env).obj(), jurl.obj(),
           jmime_type.obj(), jfilename.obj(), jpath.obj(),
           item->GetReceivedBytes(), jguid.obj(),
           joriginal_url.obj(), jreferrer_url.obj(), item->HasUserGesture());
+      DownloadControllerAndroid::RecordDownloadCancelReason(
+             DownloadControllerAndroid::CANCEL_REASON_NOT_CANCELED);
       break;
     case DownloadItem::CANCELLED:
       Java_DownloadController_onDownloadCancelled(
           env, GetJavaObject()->Controller(env).obj(), jguid.obj());
       break;
     case DownloadItem::INTERRUPTED:
       // When device loses/changes network, we get a NETWORK_TIMEOUT,
       // NETWORK_FAILED or NETWORK_DISCONNECTED error. Download should auto
       // resume in this case.
       Java_DownloadController_onDownloadInterrupted(
@@ skipping 100 matching lines @@
   if (info)
     has_user_gesture = info->HasUserGesture();
 }
 
 DownloadControllerAndroidImpl::DownloadInfoAndroid::DownloadInfoAndroid(
     const DownloadInfoAndroid& other) = default;
 
 DownloadControllerAndroidImpl::DownloadInfoAndroid::~DownloadInfoAndroid() {}
 
 }  // namespace content