[iOS] Upstream CrashReportBackgroundUploader

CrashReportBackgroundUploader handle uploading crashes in background using
iOS 7 capability of periodically waking up the application in background.

BUG=429756

Review URL: https://codereview.chromium.org/1138703004

Cr-Commit-Position: refs/heads/master@{#329643}

ios/chrome/browser/DEPS

 include_rules = [
   "+ios/chrome/grit",
 
+  "+breakpad/src/client/ios",
   "+components/autofill/core/browser",
   "+components/autofill/ios/browser",
   "+components/data_reduction_proxy/core/common",

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_

ios/chrome/ios_chrome.gyp

@@ -42,6 +42,7 @@
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_prefs',
+        '../../breakpad/breakpad.gyp:breakpad_client',
         '../../components/components.gyp:autofill_core_browser',
         '../../components/components.gyp:autofill_ios_browser',
         '../../components/components.gyp:data_reduction_proxy_core_common',
@@ -118,6 +119,8 @@
         'browser/chrome_switches.h',
         'browser/chrome_url_constants.cc',
         'browser/chrome_url_constants.h',
+        'browser/crash_report/crash_report_background_uploader.h',
+        'browser/crash_report/crash_report_background_uploader.mm',
         'browser/dom_distiller/distiller_viewer.cc',
         'browser/dom_distiller/distiller_viewer.h',
         'browser/dom_distiller/dom_distiller_service_factory.cc',

tools/metrics/actions/actions.xml

@@ -1063,6 +1063,22 @@ should be able to be added at any place in this file.
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="BackgroundUploadReportAborted">
+  <owner>olivierrobin@chromium.org</owner>
+  <owner>pkl@chromium.org</owner>
+  <description>
+    An attempt to upload a crash report as a background task failed.
+  </description>
+</action>
+
+<action name="BackgroundUploadReportSucceeded">
+  <owner>olivierrobin@chromium.org</owner>
+  <owner>pkl@chromium.org</owner>
+  <description>
+    An attempt to upload a crash report as a background task succeeeded.
+  </description>
+</action>
+
 <action name="BadMessageTerminate_ACDH">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>

tools/metrics/histograms/histograms.xml

@@ -4022,6 +4022,24 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="CrashReport.CrashBackgroundUploadDelay" units="ms">
+  <owner>olivierrobin@chromium.org</owner>
+  <owner>pkl@chromium.org</owner>
+  <summary>
+    Time delta between when the crash took place and when the crash was uploaded
+    by the app as a background task. Only logged on iOS.
+  </summary>
+</histogram>
+
+<histogram name="CrashReport.PendingReportsOnBackgroundWakeUp">
+  <owner>olivierrobin@chromium.org</owner>
+  <owner>pkl@chromium.org</owner>
+  <summary>
+    The number of crash reports present when the app wakes up as a background
+    task to upload crash reports. Only logged on iOS.
+  </summary>
+</histogram>
+
 <histogram name="CrashReport.PermanentUploadFailure" enum="BooleanHit">
   <owner>erikwright@chromium.org</owner>
   <summary>