[iOS] Upstream //ios/chrome/browser/memory

ios/chrome/browser/memory/memory_debugger.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_MEMORY_MEMORY_DEBUGGER_H_
+#define IOS_CHROME_BROWSER_MEMORY_MEMORY_DEBUGGER_H_
+
+#import <UIKit/UIKit.h>
+
+// A view that contains memory information (e.g. amount of free memory) and
+// tools (e.g. trigger memory warning) to help investigate memory issues and
+// performance.
+//
+// The debugger ensures that it remains visible by continuously calling
+// bringSubviewToFront on it's parent so it should be added as a subview of the
+// the application's window in order to stay visible all the times.
+//
+// The debugger owns some timers that must be invalidated before it can be
+// deallocated so the owner must call |invalidateTimers| before a MemoryDebugger
+// instance can be deallocated.
+@interface MemoryDebugger : UIView<UITextFieldDelegate>
+// Must be called before the object can be deallocated!
+- (void)invalidateTimers;
+@end
+
+#endif  // IOS_CHROME_BROWSER_MEMORY_MEMORY_DEBUGGER_H_