[iOS] Upstream CrashReportBackgroundUploader

ios/chrome/browser/crash_report/crash_report_background_uploader.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 IOS_CHROME_BROWSER_CRASH_REPORT_CRASH_REPORT_BACKGROUND_UPLOADER_H_
+#define IOS_CHROME_BROWSER_CRASH_REPORT_CRASH_REPORT_BACKGROUND_UPLOADER_H_
+
+#import <UIKit/UIKit.h>
+
+#include "base/ios/block_types.h"
+
+typedef void (^BackgroundFetchCompletionBlock)(UIBackgroundFetchResult);
+
+@interface CrashReportBackgroundUploader : NSObject
+
++ (instancetype)sharedInstance;
+
+// Handler for the application delegate |performFetchWithCompletionHandler|
+// message. Sends the next breakpad report if available.
++ (void)performFetchWithCompletionHandler:
+        (BackgroundFetchCompletionBlock)completionHandler;
+
+// Handler for the application delegate |handleEventsForBackgroundURLSession|
+// message. Retrieves info from the URL Session.
++ (void)handleEventsForBackgroundURLSession:(NSString*)identifier
+                          completionHandler:(ProceduralBlock)completionHandler;
+
+// Returns YES if the session is a breakpad upload session.
++ (BOOL)canHandleBackgroundURLSession:(NSString*)identifier;
+
+// Returns YES if crash reports where uploaded in the background.
++ (BOOL)hasUploadedCrashReportsInBackground;
+
+// Resets the number of crash reports that have been uploaded.
++ (void)resetReportsUploadedInBackgroundCount;
+
+// Flag to determine if there are any pending crash reports on startup. This is
+// not an indication that there are pending crash reports at the moment this
+// flag is checked.
+@property(nonatomic, assign) BOOL hasPendingCrashReportsToUploadAtStartup;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_CRASH_REPORT_CRASH_REPORT_BACKGROUND_UPLOADER_H_