Create Memory Helper for memory warnings

ios/chrome/app/application_delegate/memory_recovery_helper.h

Index: ios/chrome/app/application_delegate/memory_recovery_helper.h
diff --git a/ios/chrome/app/application_delegate/memory_recovery_helper.h b/ios/chrome/app/application_delegate/memory_recovery_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..a2450e3513196c644a4ad61e0e5e007480893aef
--- /dev/null
+++ b/ios/chrome/app/application_delegate/memory_recovery_helper.h
@@ -0,0 +1,26 @@
+// Copyright 2016 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_APP_APPLICATION_DELEGATE_MEMORY_RECOVERY_HELPER_H_
+#define IOS_CHROME_APP_APPLICATION_DELEGATE_MEMORY_RECOVERY_HELPER_H_
+
+#import <UIKit/UIKit.h>

[Eugene But (OOO till 7-30), 2016/05/18 15:55:07]

NIT: s/UIKit/Foundation there is nothing UI related in this header.

[gambard, 2016/05/19 09:35:03]

Done.

+
+// Helper for handling memory warnings

[sdefresne, 2016/05/18 18:32:38]

Please use full sentences for your comments (i.e. need a full stop at end) here
and everywhere.

[gambard, 2016/05/19 09:35:03]

Done.

+@interface MemoryRecoveryHelper : NSObject

[Eugene But (OOO till 7-30), 2016/05/18 15:55:07]

Should we be more specific with the name to reflect that this class is
responsible for memory warnings handling? F.e. MemoryWarningsHandler :)

[gambard, 2016/05/19 09:35:03]

Done.

+
+// The number of memory warnings that have been received in this
+// foreground session.
+@property(nonatomic, readonly) int foregroundMemoryWarningCount;

[sdefresne, 2016/05/18 18:32:38]

Maybe use NSInteger instead of int here?

[gambard, 2016/05/19 09:35:03]

Done.

+
+// Frees as much memory as possible and registers that there was a memory
+// pressure
+- (void)handleMemoryPressure;
+
+// Resets the foregroundMemoryWarningCount property, setting its value to 0
+- (void)resetForegroundMemoryWarningCount;
+
+@end
+
+#endif  // IOS_CHROME_APP_APPLICATION_DELEGATE_MEMORY_RECOVERY_HELPER_H_