Templatize percentile_filter.h and move it to base/analytics.

webrtc/modules/video_coding/codec_timer.h

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
 #define WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
 
 #include <queue>
 
+#include "webrtc/base/analytics/percentile_filter.h"
 #include "webrtc/modules/include/module_common_types.h"
-#include "webrtc/modules/video_coding/percentile_filter.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 class VCMCodecTimer {
  public:
   VCMCodecTimer();
 
   // Add a new decode time to the filter.
   void AddTiming(int64_t new_decode_time_ms, int64_t now_ms);
 
   // Get the required decode time in ms. It is the 95th percentile observed
   // decode time within a time window.
   int64_t RequiredDecodeTimeMs() const;
 
  private:
   struct Sample {
     Sample(int64_t decode_time_ms, int64_t sample_time_ms);
     int64_t decode_time_ms;
     int64_t sample_time_ms;
   };
 
   // The number of samples ignored so far.
   int ignored_sample_count_;
   // Queue with history of latest decode time values.
   std::queue<Sample> history_;
   // |filter_| contains the same values as |history_|, but in a data structure
   // that allows efficient retrieval of the percentile value.
-  PercentileFilter filter_;
+  PercentileFilter<int64_t> filter_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_