[iOS] Upstream some stability code

ios/chrome/browser/crash_report/breakpad_helper.h

Index: ios/chrome/browser/crash_report/breakpad_helper.h
diff --git a/ios/chrome/browser/crash_report/breakpad_helper.h b/ios/chrome/browser/crash_report/breakpad_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..0167b5cdb63128749607e6ae93289196bf78e89e
--- /dev/null
+++ b/ios/chrome/browser/crash_report/breakpad_helper.h
@@ -0,0 +1,113 @@
+// Copyright 2015 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_BREAKPAD_HELPER_H_
+#define IOS_CHROME_BROWSER_CRASH_REPORT_BREAKPAD_HELPER_H_
+
+#include <string>
+
+@class NSString;
+
+namespace breakpad_helper {
+
+// Starts the crash handlers. This must be run as soon as possible to catch
+// early crashes.
+void Start(const std::string& channel_name);
+
+// Enables/Disables crash handling.
+void SetEnabled(bool enabled);
+
+// Enable/Disable uploading crash reports.
+void SetUploadingEnabled(bool enabled);
+
+// Returns true if uploading crash reports is enabled.
+bool IsUploadingEnabled();
+
+// Cleans up all stored crash reports.
+void CleanupCrashReports();
+
+// Add a key/value pair the next crash report. If async is false, this function
+// will wait until the key is registered before returning.
+void AddReportParameter(NSString* key, NSString* value, bool async);
+
+// Remove the key/value pair associated to key from the next crash report.
+void RemoveReportParameter(NSString* key);
+
+// Returns the number of crash reports waiting to send to the server. This
+// function will wait for an operation to complete on a background thread.
+int GetCrashReportCount();
+
+// Gets the number of crash reports on a background thread and invokes
+// |callback| with the result when complete.
+void GetCrashReportCount(void (^callback)(int));
+
+// Check if there is currently a crash report to upload. This function will wait
+// for an operation to complete on a background thread.
+bool HasReportToUpload();
+
+// Sets a key if |background| is true, unset if false. This will allow tracking
+// of crashes that occur when the app is backgrounded.
+void SetCurrentlyInBackground(bool background);
+
+// Sets a key if |signedIn| is true, unset if false. The key indicates that the
+// user is signed-in.
+void SetCurrentlySignedIn(bool signedIn);
+
+// Sets a key to indicate the number of memory warnings the application has
+// received over its lifetime, or unset the key if the count is zero.
+void SetMemoryWarningCount(int count);
+
+// Sets a key indicating a memory warning is deemed to be in progress (if value
+// is 'true'), otherwise remove the key.
+void SetMemoryWarningInProgress(bool value);
+
+// Sets a key indicating the current free memory amount in KB. 0 does not remove
+// the key as getting no memory is important information.
+void SetCurrentFreeMemoryInKB(int value);
+
+// Sets a key indicating the current free disk space in KB. 0 does not remove
+// the key as getting no free disk space is important information.
+void SetCurrentFreeDiskInKB(int value);
+
+// Sets a key indicating application is using Flywheel Data Reduction Proxy.
+void SetDataReductionProxyIsEnabled(bool value);
+
+// Increases a key indicating the number of PDF tabs opened. If value is TRUE,
+// the counter is increased. If value is FALSE, the counter is decreased. If
+// counter falls to 0, the entry is removed. This function does not keep
+// previous state. If SetCurrentTabIsPDF is called twice with TRUE, the counter
+// will be incremented twice.
+void SetCurrentTabIsPDF(bool value);
+
+// Sets a key in browser_state dictionary to store the device orientation.
+// Each values is 1 digit: first is the UI orientation from the Foundation
+// UIInterfaceOrientation enum (values decimal from 1 to 4) and the second is
+// the device orientation with values from the Foundation UIDeviceOrientation
+// enum (values decimal from 0 to 7).
+void SetCurrentOrientation(int statusBarOrientation, int deviceOrientation);
+
+// Sets a key in browser to store the playback state of media player (audio or
+// video). This function records a new start. This function is called for each
+// stream in the media (once or twice for audio, two or three times for video).
+void MediaStreamPlaybackDidStart();
+
+// Sets a key in browser to store the playback state of media player (audio or
+// video). This function records a stop or pause. This function must be called
+// the same number of times as MediaStreamPlaybackDidStart.
+void MediaStreamPlaybackDidStop();
+
+// Informs the crash report helper that crash restoration is about to begin.
+void WillStartCrashRestoration();
+
+// Starts uploading crash reports. Sets the upload interval to 1 second, and
+// sets a key in uploaded reports to allow tracking of reports that are uploaded
+// in recovery mode.
+void StartUploadingReportsInRecoveryMode();
+
+// Resets the Breakpad configuration from the main bundle.
+void RestoreDefaultConfiguration();
+
+}  // namespace breakpad_helper
+
+#endif  // IOS_CHROME_BROWSER_CRASH_REPORT_BREAKPAD_HELPER_H_