Makes sure the keyboard typing isn't blocked when InputMethod::OnFocus() is not correctly called.

ui/base/ime/input_method_log_collector.h

+// 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 UI_BASE_IME_INPUT_METHOD_LOG_COLLECTOR_H_
+#define UI_BASE_IME_INPUT_METHOD_LOG_COLLECTOR_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "ui/base/ime/ui_base_ime_export.h"
+
+namespace ui {
+
+// The class to gather some logs and dump it through
+// base::debug::DumpWithoutCrashing when InputMethod processing a key event.
+// This is for tracing the issue that hardly repros: crbug.com/569339.
+class UI_BASE_IME_EXPORT InputMethodLogCollector {
+ public:
+  InputMethodLogCollector();
+  ~InputMethodLogCollector();
+  void AddString(const char* str_val);
+  void AddBoolean(bool bool_val);
+  void DumpLogs();
+  void ClearLogs();
+
+ private:
+  std::vector<const char*> logs_;
+
+  DISALLOW_COPY_AND_ASSIGN(InputMethodLogCollector);
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_IME_INPUT_METHOD_LOG_COLLECTOR_H_