Revert of 83710 which reverted 83641 - DNS Host resolver changes

with retry logic. Fix for bug Chromium cannot recover from a state
when its DNS requests have been dropped.

Whenever we try to resolve the host, we post a delayed task
to check if host resolution (OnLookupComplete) is completed 
or not. If it hasn't completed, then we start a new job 
to resolve for the same request.

BUG=73327
TEST=dns host resolver tests
R=eroman,jar
Review URL: http://codereview.chromium.org/6976006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@84908 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 22 insertions, 0 deletions

diff --git a/base/metrics/histogram_unittest.cc b/base/metrics/histogram_unittest.cc
index 496ff63..9d671df 100644
--- a/base/metrics/histogram_unittest.cc
+++ b/base/metrics/histogram_unittest.cc
@@ -288,6 +288,28 @@ TEST(HistogramTest, BoundsTest) {
   EXPECT_EQ(kBucketCount, array_size);
   EXPECT_EQ(0, sample.counts(array_size - 2));
   EXPECT_EQ(2, sample.counts(array_size - 1));
+
+  std::vector<int> custom_ranges;
+  custom_ranges.push_back(10);
+  custom_ranges.push_back(50);
+  custom_ranges.push_back(100);
+  Histogram* test_custom_histogram(CustomHistogram::FactoryGet(
+      "TestCustomRangeBoundedHistogram", custom_ranges, Histogram::kNoFlags));
+
+  // Put two samples "out of bounds" above and below.
+  test_custom_histogram->Add(5);
+  test_custom_histogram->Add(-50);
+  test_custom_histogram->Add(100);
+  test_custom_histogram->Add(1000);
+
+  // Verify they landed in the underflow, and overflow buckets.
+  Histogram::SampleSet custom_sample;
+  test_custom_histogram->SnapshotSample(&custom_sample);
+  EXPECT_EQ(2, custom_sample.counts(0));
+  EXPECT_EQ(0, custom_sample.counts(1));
+  size_t custom_array_size = test_custom_histogram->bucket_count();
+  EXPECT_EQ(0, custom_sample.counts(custom_array_size - 2));
+  EXPECT_EQ(2, custom_sample.counts(custom_array_size - 1));
 }
 
 // Check to be sure samples land as expected is "correct" buckets.