Moving src/webrtc into src/.

In order to eliminate the WebRTC Subtree mirror in Chromium, 
WebRTC is moving the content of the src/webrtc directory up
to the src/ directory.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org

Bug: chromium:611808
Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38
Reviewed-on: https://webrtc-review.googlesource.com/1560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19845}

modules/video_coding/codec_timer.cc

@@ -0,0 +1,56 @@
+/*
+ *  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.
+ */
+
+#include "webrtc/modules/video_coding/codec_timer.h"
+
+namespace webrtc {
+
+namespace {
+
+// The first kIgnoredSampleCount samples will be ignored.
+const int kIgnoredSampleCount = 5;
+// Return the |kPercentile| value in RequiredDecodeTimeMs().
+const float kPercentile = 0.95f;
+// The window size in ms.
+const int64_t kTimeLimitMs = 10000;
+
+}  // anonymous namespace
+
+VCMCodecTimer::VCMCodecTimer()
+    : ignored_sample_count_(0), filter_(kPercentile) {}
+
+void VCMCodecTimer::AddTiming(int64_t decode_time_ms, int64_t now_ms) {
+  // Ignore the first |kIgnoredSampleCount| samples.
+  if (ignored_sample_count_ < kIgnoredSampleCount) {
+    ++ignored_sample_count_;
+    return;
+  }
+
+  // Insert new decode time value.
+  filter_.Insert(decode_time_ms);
+  history_.emplace(decode_time_ms, now_ms);
+
+  // Pop old decode time values.
+  while (!history_.empty() &&
+         now_ms - history_.front().sample_time_ms > kTimeLimitMs) {
+    filter_.Erase(history_.front().decode_time_ms);
+    history_.pop();
+  }
+}
+
+// Get the 95th percentile observed decode time within a time window.
+int64_t VCMCodecTimer::RequiredDecodeTimeMs() const {
+  return filter_.GetPercentileValue();
+}
+
+VCMCodecTimer::Sample::Sample(int64_t decode_time_ms, int64_t sample_time_ms)
+    : decode_time_ms(decode_time_ms), sample_time_ms(sample_time_ms) {}
+
+}  // namespace webrtc