Revert of Move Java CachedMetrics functionality to base/.

base/android/java/src/org/chromium/base/metrics/CachedMetrics.java

Index: base/android/java/src/org/chromium/base/metrics/CachedMetrics.java
diff --git a/base/android/java/src/org/chromium/base/metrics/CachedMetrics.java b/base/android/java/src/org/chromium/base/metrics/CachedMetrics.java
deleted file mode 100644
index f57dba23e14f10bb6bd124823171ceafcd5cb26b..0000000000000000000000000000000000000000
--- a/base/android/java/src/org/chromium/base/metrics/CachedMetrics.java
+++ /dev/null
@@ -1,169 +0,0 @@
-// 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.
-
-package org.chromium.base.metrics;
-
-import org.chromium.base.library_loader.LibraryLoader;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.concurrent.TimeUnit;
-
-/**
- * Utility classes for recording UMA metrics before the native library
- * may have been loaded.  Metrics are cached until the library is known
- * to be loaded, then committed to the MetricsService all at once.
- */
-public class CachedMetrics {
-    /**
-     * Creating an instance of a subclass of this class automatically adds it to a list of objects
-     * that are committed when the native library is available.
-     */
-    private abstract static class CachedHistogram {
-        private static final List<CachedHistogram> sEvents = new ArrayList<CachedHistogram>();
-
-        protected final String mHistogramName;
-
-        /**
-         * @param histogramName Name of the histogram to record.
-         */
-        protected CachedHistogram(String histogramName) {
-            mHistogramName = histogramName;
-            sEvents.add(this);
-        }
-
-        /** Commits the histogram. Expects the native library to be loaded. */
-        protected abstract void commitAndClear();
-    }
-
-    /**
-     * Caches an action that will be recorded after native side is loaded.
-     */
-    public static class ActionEvent extends CachedHistogram {
-        private int mCount;
-
-        public ActionEvent(String actionName) {
-            super(actionName);
-        }
-
-        public void record() {
-            if (LibraryLoader.isInitialized()) {
-                recordWithNative();
-            } else {
-                mCount++;
-            }
-        }
-
-        private void recordWithNative() {
-            RecordUserAction.record(mHistogramName);
-        }
-
-        @Override
-        protected void commitAndClear() {
-            while (mCount > 0) {
-                recordWithNative();
-                mCount--;
-            }
-        }
-    }
-
-    /** Caches a set of integer histogram samples. */
-    public static class SparseHistogramSample extends CachedHistogram {
-        private final List<Integer> mSamples = new ArrayList<Integer>();
-
-        public SparseHistogramSample(String histogramName) {
-            super(histogramName);
-        }
-
-        public void record(int sample) {
-            if (LibraryLoader.isInitialized()) {
-                recordWithNative(sample);
-            } else {
-                mSamples.add(sample);
-            }
-        }
-
-        private void recordWithNative(int sample) {
-            RecordHistogram.recordSparseSlowlyHistogram(mHistogramName, sample);
-        }
-
-        @Override
-        protected void commitAndClear() {
-            for (Integer sample : mSamples) {
-                recordWithNative(sample);
-            }
-            mSamples.clear();
-        }
-    }
-
-    /** Caches a set of enumerated histogram samples. */
-    public static class EnumeratedHistogramSample extends CachedHistogram {
-        private final List<Integer> mSamples = new ArrayList<Integer>();
-        private final int mMaxValue;
-
-        public EnumeratedHistogramSample(String histogramName, int maxValue) {
-            super(histogramName);
-            mMaxValue = maxValue;
-        }
-
-        public void record(int sample) {
-            if (LibraryLoader.isInitialized()) {
-                recordWithNative(sample);
-            } else {
-                mSamples.add(sample);
-            }
-        }
-
-        private void recordWithNative(int sample) {
-            RecordHistogram.recordEnumeratedHistogram(mHistogramName, sample, mMaxValue);
-        }
-
-        @Override
-        protected void commitAndClear() {
-            for (Integer sample : mSamples) {
-                recordWithNative(sample);
-            }
-            mSamples.clear();
-        }
-    }
-
-    /** Caches a set of times histogram samples. */
-    public static class TimesHistogramSample extends CachedHistogram {
-        private final List<Long> mSamples = new ArrayList<Long>();
-        private final TimeUnit mTimeUnit;
-
-        public TimesHistogramSample(String histogramName, TimeUnit timeUnit) {
-            super(histogramName);
-            mTimeUnit = timeUnit;
-        }
-
-        public void record(long sample) {
-            if (LibraryLoader.isInitialized()) {
-                recordWithNative(sample);
-            } else {
-                mSamples.add(sample);
-            }
-        }
-
-        private void recordWithNative(long sample) {
-            RecordHistogram.recordTimesHistogram(mHistogramName, sample, mTimeUnit);
-        }
-
-        @Override
-        protected void commitAndClear() {
-            for (Long sample : mSamples) {
-                recordWithNative(sample);
-            }
-            mSamples.clear();
-        }
-    }
-
-    /**
-     * Calls out to native code to commit any cached histograms and events.
-     * Should be called once the native library has been loaded.
-     */
-    public static void commitCachedMetrics() {
-        for (CachedHistogram event : CachedHistogram.sEvents) event.commitAndClear();
-    }
-}