Handle cross origin with src attribution for descendants

third_party/WebKit/Source/core/inspector/InspectorWebPerfAgentTest.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorWebPerfAgentTest.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgentTest.cpp b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgentTest.cpp
index 066e35ba5fabba1a789e8daa14479f47dd0a5391..c0383b722d78423b8c600bc5939803b522e9eee7 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgentTest.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorWebPerfAgentTest.cpp
@@ -141,4 +141,16 @@ TEST_F(InspectorWebPerfAgentTest, SanitizedLongTaskName)
         sanitizedLongTaskName(frameContextLocations, frame()));
 }
 
+TEST_F(InspectorWebPerfAgentTest, SanitizedLongTaskName_CrossOrigin)

[skobes, 2016/09/30 21:45:01]

As discussed offline I think it should not be too hard to test parent/child
frame cases, you can create a child frame with code similar to how
DummyPageHolder creates the main frame.

[panicker, 2016/09/30 22:57:15]

I tried this today (again), it adds non-trivial setup code and still doesn't
work as expected. 
See: https://codereview.chromium.org/2385873003
Even with all that code the child iframe still shows up as "about:blank" and
falls into the same-origin code path.
Let me know if you have specific suggestions.

I suspect if I copied all the code in
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/layout/La...

it would likely work, but it doesn't seem like a unittest at this point.

My conclusion is that this is better suited to a layout test which I will add as
follow-up.

[skobes, 2016/09/30 23:00:16]

Acknowledged.

+{
+    HeapHashSet<Member<Location>> frameContextLocations;
+    // Unable to attribute, when no execution contents are available.
+    EXPECT_EQ("unknown",
+        sanitizedLongTaskName(frameContextLocations, frame()));
+
+    frameContextLocations.add(Location::create(anotherFrame()));
+    EXPECT_EQ("cross-origin",
+        sanitizedLongTaskName(frameContextLocations, frame()));
+}
+
 } // namespace blink