Avoid discarding freshly created background tabs

content/browser/web_contents/web_contents_impl_unittest.cc

Index: content/browser/web_contents/web_contents_impl_unittest.cc
diff --git a/content/browser/web_contents/web_contents_impl_unittest.cc b/content/browser/web_contents/web_contents_impl_unittest.cc
index 846a86198436d8bdb5bfb2b72e88eff5e9b1366d..d7834b0b0a1c9c366528ac3fda4bbd449ead3b88 100644
--- a/content/browser/web_contents/web_contents_impl_unittest.cc
+++ b/content/browser/web_contents/web_contents_impl_unittest.cc
@@ -2216,4 +2216,19 @@ TEST_F(WebContentsImplTest, CapturerOverridesPreferredSize) {
   EXPECT_EQ(original_preferred_size, contents()->GetPreferredSize());
 }
 
+// Tests that GetLastActiveTime starts with a real, non-zero time and updates
+// on activity.
+TEST_F(WebContentsImplTest, GetLastActiveTime) {
+  // The WebContents starts with a valid creation time.
+  EXPECT_FALSE(contents()->GetLastActiveTime().is_null());
+
+  // Reset the last active time to a known-bad value.
+  contents()->last_active_time_ = base::TimeTicks();
+  ASSERT_TRUE(contents()->GetLastActiveTime().is_null());
+
+  // Simulate activating the WebContents. The active time should update.
+  contents()->WasShown();
+  EXPECT_FALSE(contents()->GetLastActiveTime().is_null());
+}
+
 }  // namespace content