Record call site history in LeakDetectorImpl

components/metrics/leak_detector/ranked_set_unittest.cc

Index: components/metrics/leak_detector/ranked_set_unittest.cc
diff --git a/components/metrics/leak_detector/ranked_set_unittest.cc b/components/metrics/leak_detector/ranked_set_unittest.cc
index 2e2de01c8b771e426824ee44f365d63a0fbcb873..0cb260d9d15089b4dd3e5710162026c7ca0f80c8 100644
--- a/components/metrics/leak_detector/ranked_set_unittest.cc
+++ b/components/metrics/leak_detector/ranked_set_unittest.cc
@@ -320,5 +320,42 @@ TEST_F(RankedSetTest, MoveOperation) {
   }
 }
 
+TEST_F(RankedSetTest, Find) {
+  RankedSet set(10);
+  EXPECT_EQ(0U, set.size());
+
+  set.AddSize(0x1234, 15);
+  set.AddSize(0x2345, 20);
+  set.AddSize(0x3456, 10);
+  set.AddSize(0x4567, 30);
+  set.AddSize(0x5678, 25);
+  EXPECT_EQ(5U, set.size());
+
+  auto iter = set.FindSize(0x1234);
+  EXPECT_TRUE(iter != set.end());
+  EXPECT_EQ(0x1234U, iter->value.size());
+  EXPECT_EQ(15, iter->count);
+
+  iter = set.FindSize(0x2345);
+  EXPECT_TRUE(iter != set.end());
+  EXPECT_EQ(0x2345U, iter->value.size());
+  EXPECT_EQ(20, iter->count);
+
+  iter = set.FindSize(0x3456);
+  EXPECT_TRUE(iter != set.end());
+  EXPECT_EQ(0x3456U, iter->value.size());
+  EXPECT_EQ(10, iter->count);
+
+  iter = set.FindSize(0x4567);
+  EXPECT_TRUE(iter != set.end());
+  EXPECT_EQ(0x4567U, iter->value.size());
+  EXPECT_EQ(30, iter->count);
+
+  iter = set.FindSize(0x5678);
+  EXPECT_TRUE(iter != set.end());
+  EXPECT_EQ(0x5678U, iter->value.size());
+  EXPECT_EQ(25, iter->count);
+}
+
 }  // namespace leak_detector
 }  // namespace metrics