Add UMA metrics to record the size of internal memory available on a user's device when the Update …

base/android/javatests/src/org/chromium/base/metrics/RecordHistogramTest.java

Index: base/android/javatests/src/org/chromium/base/metrics/RecordHistogramTest.java
diff --git a/base/android/javatests/src/org/chromium/base/metrics/RecordHistogramTest.java b/base/android/javatests/src/org/chromium/base/metrics/RecordHistogramTest.java
index 1bf9c216145da7020f72c5699c153564c1b7d0ce..6b1888ce59ca62cc586dfd6260b7731761a9e431 100644
--- a/base/android/javatests/src/org/chromium/base/metrics/RecordHistogramTest.java
+++ b/base/android/javatests/src/org/chromium/base/metrics/RecordHistogramTest.java
@@ -157,4 +157,37 @@ public class RecordHistogramTest extends InstrumentationTestCase {
         assertEquals(1, oneCount.getDelta());
         assertEquals(1, twoCount.getDelta());
     }
+
+    /**
+     * Tests recording of linear count histograms.
+     */
+    @SmallTest
+    public void testRecordLinearCountHistogram() {
+        String histogram = "HelloWorld.LinearCountMetric";
+        HistogramDelta zeroCount = new HistogramDelta(histogram, 0);
+        HistogramDelta oneCount = new HistogramDelta(histogram, 1);
+        HistogramDelta twoCount = new HistogramDelta(histogram, 2);
+        final int min = 1;
+        final int max = 3;
+        final int numBuckets = 4;
+
+        assertEquals(0, zeroCount.getDelta());
+        assertEquals(0, oneCount.getDelta());
+        assertEquals(0, twoCount.getDelta());
+
+        RecordHistogram.recordLinearCountHistogram(histogram, 0, min, max, numBuckets);
+        assertEquals(1, zeroCount.getDelta());
+        assertEquals(0, oneCount.getDelta());
+        assertEquals(0, twoCount.getDelta());
+
+        RecordHistogram.recordLinearCountHistogram(histogram, 0, min, max, numBuckets);
+        assertEquals(2, zeroCount.getDelta());
+        assertEquals(0, oneCount.getDelta());
+        assertEquals(0, twoCount.getDelta());
+
+        RecordHistogram.recordLinearCountHistogram(histogram, 2, min, max, numBuckets);
+        assertEquals(2, zeroCount.getDelta());
+        assertEquals(0, oneCount.getDelta());
+        assertEquals(1, twoCount.getDelta());
+    }
 }