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::kNoStoragePermission);
+  }
   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, kCancelReasonMax);
+}
+
+// static
 DownloadControllerAndroidImpl* DownloadControllerAndroidImpl::GetInstance() {
   return base::Singleton<DownloadControllerAndroidImpl>::get();
 }
 
 DownloadControllerAndroidImpl::DownloadControllerAndroidImpl()
     : java_object_(NULL) {
 }
 
 DownloadControllerAndroidImpl::~DownloadControllerAndroidImpl() {
   if (java_object_) {
@@ skipping 432 matching lines @@
   if (info)
     has_user_gesture = info->HasUserGesture();
 }
 
 DownloadControllerAndroidImpl::DownloadInfoAndroid::DownloadInfoAndroid(
     const DownloadInfoAndroid& other) = default;
 
 DownloadControllerAndroidImpl::DownloadInfoAndroid::~DownloadInfoAndroid() {}
 
 }  // namespace content