Move CPDFSDK_Annot, CPDFSDK_BAAnnot and CPDFSDK_DateTime to their own files.

fpdfsdk/include/cpdfsdk_datetime.h

Index: fpdfsdk/include/cpdfsdk_datetime.h
diff --git a/fpdfsdk/include/cpdfsdk_datetime.h b/fpdfsdk/include/cpdfsdk_datetime.h
new file mode 100644
index 0000000000000000000000000000000000000000..785d96adc42e12da75e3c1957a9bc0ba4b08fbe4
--- /dev/null
+++ b/fpdfsdk/include/cpdfsdk_datetime.h
@@ -0,0 +1,52 @@
+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef FPDFSDK_INCLUDE_CPDFSDK_DATETIME_H_
+#define FPDFSDK_INCLUDE_CPDFSDK_DATETIME_H_
+
+#if _FX_OS_ == _FX_ANDROID_
+#include "time.h"
+#else
+#include <ctime>
+#endif
+
+#include "fpdfsdk/cfx_systemhandler.h"
+
+class CPDFSDK_DateTime {
+ public:
+  CPDFSDK_DateTime();
+  explicit CPDFSDK_DateTime(const CFX_ByteString& dtStr);
+  explicit CPDFSDK_DateTime(const FX_SYSTEMTIME& st);
+  CPDFSDK_DateTime(const CPDFSDK_DateTime& datetime);
+
+  bool operator==(const CPDFSDK_DateTime& datetime) const;
+  bool operator!=(const CPDFSDK_DateTime& datetime) const;
+
+  CPDFSDK_DateTime& FromPDFDateTimeString(const CFX_ByteString& dtStr);
+  CFX_ByteString ToCommonDateTimeString();
+  CFX_ByteString ToPDFDateTimeString();
+  void ToSystemTime(FX_SYSTEMTIME& st);
+  time_t ToTime_t() const;
+  CPDFSDK_DateTime ToGMT() const;
+  CPDFSDK_DateTime& AddDays(short days);
+  CPDFSDK_DateTime& AddSeconds(int seconds);
+
+  void ResetDateTime();
+
+ private:
+  struct FX_DATETIME {
+    int16_t year;
+    uint8_t month;
+    uint8_t day;
+    uint8_t hour;
+    uint8_t minute;
+    uint8_t second;
+    int8_t tzHour;
+    uint8_t tzMinute;
+  } dt;
+};
+
+#endif  // FPDFSDK_INCLUDE_CPDFSDK_DATETIME_H_