Cross-origin iframes: collect data under hypothetical loading strategies

third_party/WebKit/Source/web/tests/DeferredLoadingTest.cpp

Index: third_party/WebKit/Source/web/tests/DeferredLoadingTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/DeferredLoadingTest.cpp b/third_party/WebKit/Source/web/tests/DeferredLoadingTest.cpp
index aba9e636a92dcd006f6b3b6a58d4d718a849580f..5bce5a139501596ed24ffef1731c056deb798103 100644
--- a/third_party/WebKit/Source/web/tests/DeferredLoadingTest.cpp
+++ b/third_party/WebKit/Source/web/tests/DeferredLoadingTest.cpp
@@ -13,17 +13,16 @@
 namespace blink {
 
 static const char* kHistogramName =
-    "Navigation.DeferredDocumentLoading.StatesV3";
+    "Navigation.DeferredDocumentLoading.StatesV4";
 
 class DeferredLoadingTest : public SimTest {
  protected:
   DeferredLoadingTest() { webView().resize(WebSize(640, 480)); }
   void compositeFrame() {
-    compositor().beginFrame();
-    testing::runPendingTasks();
-    if (compositor().needsBeginFrame())
-      compositor().beginFrame();  // VisibleNestedInRight doesn't need this.
-    ASSERT_FALSE(compositor().needsBeginFrame());
+    while (compositor().needsBeginFrame()) {
+      compositor().beginFrame();
+      testing::runPendingTasks();
+    }
   }
 
   std::unique_ptr<SimRequest> createMainResource() {
@@ -44,6 +43,10 @@ TEST_F(DeferredLoadingTest, Visible) {
 
   histogramTester.expectBucketCount(kHistogramName, Created, 1);
   histogramTester.expectBucketCount(kHistogramName, WouldLoadVisible, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad1ScreenAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 1);
+  histogramTester.expectTotalCount(kHistogramName, 5);
 }
 
 TEST_F(DeferredLoadingTest, Right) {
@@ -59,17 +62,19 @@ TEST_F(DeferredLoadingTest, Right) {
   histogramTester.expectTotalCount(kHistogramName, 1);
 }
 
-TEST_F(DeferredLoadingTest, Below) {
+TEST_F(DeferredLoadingTest, TwoScreensBelow) {
   HistogramTester histogramTester;
   std::unique_ptr<SimRequest> mainResource = createMainResource();
 
   mainResource->complete(
-      "<iframe style='position:absolute; top:105vh;' sandbox></iframe>");
+      "<iframe style='position:absolute; top:205vh;' sandbox></iframe>");
 
   compositeFrame();
 
   histogramTester.expectBucketCount(kHistogramName, Created, 1);
-  histogramTester.expectTotalCount(kHistogramName, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 1);
+  histogramTester.expectTotalCount(kHistogramName, 3);
 }
 
 TEST_F(DeferredLoadingTest, Above) {
@@ -82,7 +87,11 @@ TEST_F(DeferredLoadingTest, Above) {
   compositeFrame();
 
   histogramTester.expectBucketCount(kHistogramName, Created, 1);
-  histogramTester.expectBucketCount(kHistogramName, WouldLoadAbove, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadVisible, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad1ScreenAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 1);
+  histogramTester.expectTotalCount(kHistogramName, 5);
 }
 
 TEST_F(DeferredLoadingTest, Left) {
@@ -95,7 +104,11 @@ TEST_F(DeferredLoadingTest, Left) {
   compositeFrame();
 
   histogramTester.expectBucketCount(kHistogramName, Created, 1);
-  histogramTester.expectBucketCount(kHistogramName, WouldLoadLeft, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadVisible, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad1ScreenAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 1);
+  histogramTester.expectTotalCount(kHistogramName, 5);
 }
 
 TEST_F(DeferredLoadingTest, AboveAndLeft) {
@@ -109,8 +122,8 @@ TEST_F(DeferredLoadingTest, AboveAndLeft) {
   compositeFrame();
 
   histogramTester.expectBucketCount(kHistogramName, Created, 1);
-  histogramTester.expectBucketCount(kHistogramName, WouldLoadAboveAndLeft, 1);
-  histogramTester.expectTotalCount(kHistogramName, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadVisible, 1);
+  histogramTester.expectTotalCount(kHistogramName, 5);
 }
 
 TEST_F(DeferredLoadingTest, ZeroByZero) {
@@ -123,7 +136,7 @@ TEST_F(DeferredLoadingTest, ZeroByZero) {
   compositeFrame();
 
   histogramTester.expectBucketCount(kHistogramName, Created, 1);
-  histogramTester.expectBucketCount(kHistogramName, WouldLoadZeroByZero, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadVisible, 1);
 }
 
 TEST_F(DeferredLoadingTest, DisplayNone) {
@@ -135,23 +148,29 @@ TEST_F(DeferredLoadingTest, DisplayNone) {
   compositeFrame();
 
   histogramTester.expectBucketCount(kHistogramName, Created, 1);
-  histogramTester.expectBucketCount(kHistogramName, WouldLoadDisplayNone, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadNoParent, 1);
+  histogramTester.expectTotalCount(kHistogramName, 6);
 }
 
-TEST_F(DeferredLoadingTest, VisibleNestedInRight) {
+TEST_F(DeferredLoadingTest, DisplayNoneIn2ScreensBelow) {
   HistogramTester histogramTester;
   std::unique_ptr<SimRequest> mainResource = createMainResource();
   SimRequest frameResource("https://example.com/iframe.html", "text/html");
 
   mainResource->complete(
-      "<iframe style='position:absolute; left:105vw;' src='iframe.html' "
-      "sandbox></iframe>");
-  frameResource.complete("<iframe sandbox></iframe>");
+      "<iframe style='position:absolute; top:205vh' "
+      "src='iframe.html' sandbox></iframe>");
+  frameResource.complete("<iframe style='display:none' sandbox></iframe>");
 
   compositeFrame();
 
   histogramTester.expectBucketCount(kHistogramName, Created, 2);
-  histogramTester.expectTotalCount(kHistogramName, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadNoParent, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadVisible, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad1ScreenAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 2);
+  histogramTester.expectTotalCount(kHistogramName, 9);
 }
 
 TEST_F(DeferredLoadingTest, LeftNestedInBelow) {
@@ -168,7 +187,123 @@ TEST_F(DeferredLoadingTest, LeftNestedInBelow) {
   compositeFrame();
 
   histogramTester.expectBucketCount(kHistogramName, Created, 2);
-  histogramTester.expectTotalCount(kHistogramName, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad1ScreenAway, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 2);
+  histogramTester.expectTotalCount(kHistogramName, 8);
+}
+
+TEST_F(DeferredLoadingTest, OneScreenBelowThenVisible) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+
+  mainResource->start();
+  mainResource->write(
+      "<iframe id='theFrame' style='position:absolute; top:105vh;' "
+      "sandbox></iframe>");
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 1);
+  histogramTester.expectTotalCount(kHistogramName, 4);
+
+  mainResource->write("<script>theFrame.style.top='10px'</script>");
+  mainResource->finish();
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadVisible, 1);
+  histogramTester.expectTotalCount(kHistogramName, 5);
+}
+
+TEST_F(DeferredLoadingTest, DisplayNoneThenTwoScreensAway) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+
+  mainResource->start();
+  mainResource->write(
+      "<iframe id='theFrame' style='display:none' sandbox></iframe>");
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 1);
+  histogramTester.expectTotalCount(kHistogramName, 6);
+
+  mainResource->write(
+      "<script>theFrame.style.top='200vh';"
+      "theFrame.style.position='absolute';"
+      "theFrame.style.display='block';</script>");
+  mainResource->finish();
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadNoParent, 1);
+  histogramTester.expectTotalCount(kHistogramName, 6);
+}
+
+TEST_F(DeferredLoadingTest, DisplayNoneAsync) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+
+  mainResource->start();
+  mainResource->write("some stuff");
+
+  compositeFrame();
+
+  mainResource->write(
+      "<script>frame = document.createElement('iframe');"
+      "frame.setAttribute('sandbox', true);"
+      "frame.style.display = 'none';"
+      "document.body.appendChild(frame);"
+      "</script>");
+  mainResource->finish();
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadNoParent, 1);
+  histogramTester.expectTotalCount(kHistogramName, 6);
+}
+
+// Documents some weird counting with display:none frames: If a frame changes to
+// display:none we don't count it as such until another frame is created. This
+// is hopefully rare in practice though.
+TEST_F(DeferredLoadingTest, TwoScreensAwayThenDisplayNoneThenNew) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+
+  mainResource->start();
+  mainResource->write(
+      "<iframe id='theFrame' style='position:absolute; top:205vh' sandbox>"
+      "</iframe>");
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 1);
+  histogramTester.expectTotalCount(kHistogramName, 3);
+
+  mainResource->write("<script>theFrame.style.display='none'</script>");
+
+  compositeFrame();
+
+  histogramTester.expectTotalCount(kHistogramName, 3);
+
+  mainResource->write(
+      "<script>document.body.appendChild(document.createElement"
+      "('iframe'));</script>");
+  mainResource->finish();
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadNoParent, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadVisible, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad1ScreenAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 1);
+  histogramTester.expectTotalCount(kHistogramName, 6);
 }
 
 TEST_F(DeferredLoadingTest, SameOriginNotCounted) {
@@ -183,4 +318,126 @@ TEST_F(DeferredLoadingTest, SameOriginNotCounted) {
   histogramTester.expectTotalCount(kHistogramName, 0);
 }
 
+TEST_F(DeferredLoadingTest, AboveNestedInThreeScreensBelow) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+  SimRequest frameResource("https://example.com/iframe.html", "text/html");
+
+  mainResource->complete(
+      "<iframe style='position:absolute; top:300vh' src='iframe.html' "
+      "sandbox></iframe>");
+  frameResource.complete(
+      "<iframe style='position:absolute; top:-10000px;' sandbox></iframe>");
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 2);
+  histogramTester.expectTotalCount(kHistogramName, 4);
+}
+
+TEST_F(DeferredLoadingTest, VisibleNestedInTwoScreensBelow) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+  SimRequest frameResource("https://example.com/iframe.html", "text/html");
+
+  mainResource->complete(
+      "<iframe style='position:absolute; top:205vh' src='iframe.html' "
+      "sandbox></iframe>");
+  frameResource.complete("<iframe sandbox></iframe>");
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 2);
+  histogramTester.expectTotalCount(kHistogramName, 6);
+}
+
+TEST_F(DeferredLoadingTest, ThreeScreensBelowNestedInTwoScreensBelow) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+  SimRequest frameResource("https://example.com/iframe.html", "text/html");
+
+  mainResource->complete(
+      "<iframe style='position:absolute; top:205vh' src='iframe.html' "
+      "sandbox></iframe>");
+  frameResource.complete(
+      "<iframe style='position:absolute; top:305vh' sandbox></iframe>");
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 2);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 2);
+  histogramTester.expectTotalCount(kHistogramName, 5);
+}
+
+TEST_F(DeferredLoadingTest, TriplyNested) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+  SimRequest frameResource("https://example.com/iframe.html", "text/html");
+  SimRequest frameResource2("https://example.com/iframe2.html", "text/html");
+
+  mainResource->complete(
+      "<iframe style='position:absolute; top:300vh' src='iframe.html' "
+      "sandbox></iframe>");
+  frameResource.complete(
+      "<iframe style='position:absolute; top:200vh' src='iframe2.html' "
+      "sandbox></iframe>");
+  frameResource2.complete(
+      "<iframe style='position:absolute; top:100vh' sandbox></iframe>");
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 3);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 3);
+  histogramTester.expectTotalCount(kHistogramName, 6);
+}
+
+TEST_F(DeferredLoadingTest, QuadruplyNested) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+  SimRequest frameResource("https://example.com/iframe.html", "text/html");
+  SimRequest frameResource2("https://example.com/iframe2.html", "text/html");
+  SimRequest frameResource3("https://example.com/iframe3.html", "text/html");
+
+  mainResource->complete(
+      "<iframe style='position:absolute; top:300vh' src='iframe.html' "
+      "sandbox></iframe>");
+  frameResource.complete(
+      "<iframe style='position:absolute; top:200vh' src='iframe2.html' "
+      "sandbox></iframe>");
+  frameResource2.complete(
+      "<iframe style='position:absolute; top:100vh' src='iframe3.html' "
+      "sandbox></iframe>");
+  frameResource3.complete(
+      "<iframe style='position:absolute; top:100vh' sandbox></iframe>");
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 4);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 4);
+  histogramTester.expectTotalCount(kHistogramName, 8);
+}
+
+TEST_F(DeferredLoadingTest, VisibleCrossOriginNestedInBelowFoldSameOrigin) {
+  HistogramTester histogramTester;
+  std::unique_ptr<SimRequest> mainResource = createMainResource();
+  SimRequest frameResource("https://example.com/iframe.html", "text/html");
+
+  mainResource->complete(
+      "<iframe style='position:absolute; top:105vh' src='iframe.html'>"
+      "</iframe>");
+  frameResource.complete("<iframe sandbox></iframe>");
+
+  compositeFrame();
+
+  histogramTester.expectBucketCount(kHistogramName, Created, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoadVisible, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad1ScreenAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad2ScreensAway, 1);
+  histogramTester.expectBucketCount(kHistogramName, WouldLoad3ScreensAway, 1);
+  histogramTester.expectTotalCount(kHistogramName, 5);
+}
+
 }  // namespace blink