Add UseCounters for alert(), confirm() and prompt() usage against site engagement.

third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp

Index: third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp b/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
index 072efbeee2d8de568d9b1df76cce41f89f5de464..a02b9a719497add21bb39e288c461aadd3ae46be 100644
--- a/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp
@@ -745,6 +745,27 @@ void LocalDOMWindow::alert(ScriptState* scriptState, const String& message) {
     return;
   }
 
+  switch (document()->getEngagementLevel()) {
+    case mojom::blink::EngagementLevel::NONE:
+      UseCounter::count(document(), UseCounter::AlertEngagementNone);
+      break;
+    case mojom::blink::EngagementLevel::MINIMAL:
+      UseCounter::count(document(), UseCounter::AlertEngagementMinimal);
+      break;
+    case mojom::blink::EngagementLevel::LOW:
+      UseCounter::count(document(), UseCounter::AlertEngagementLow);
+      break;
+    case mojom::blink::EngagementLevel::MEDIUM:
+      UseCounter::count(document(), UseCounter::AlertEngagementMedium);
+      break;
+    case mojom::blink::EngagementLevel::HIGH:
+      UseCounter::count(document(), UseCounter::AlertEngagementHigh);
+      break;
+    case mojom::blink::EngagementLevel::MAX:
+      UseCounter::count(document(), UseCounter::AlertEngagementMax);
+      break;
+  }
+
   if (v8::MicrotasksScope::IsRunningMicrotasks(scriptState->isolate())) {
     UseCounter::count(document(), UseCounter::During_Microtask_Alert);
   }
@@ -774,6 +795,27 @@ bool LocalDOMWindow::confirm(ScriptState* scriptState, const String& message) {
     return false;
   }
 
+  switch (document()->getEngagementLevel()) {
+    case mojom::blink::EngagementLevel::NONE:
+      UseCounter::count(document(), UseCounter::ConfirmEngagementNone);
+      break;
+    case mojom::blink::EngagementLevel::MINIMAL:
+      UseCounter::count(document(), UseCounter::ConfirmEngagementMinimal);
+      break;
+    case mojom::blink::EngagementLevel::LOW:
+      UseCounter::count(document(), UseCounter::ConfirmEngagementLow);
+      break;
+    case mojom::blink::EngagementLevel::MEDIUM:
+      UseCounter::count(document(), UseCounter::ConfirmEngagementMedium);
+      break;
+    case mojom::blink::EngagementLevel::HIGH:
+      UseCounter::count(document(), UseCounter::ConfirmEngagementHigh);
+      break;
+    case mojom::blink::EngagementLevel::MAX:
+      UseCounter::count(document(), UseCounter::ConfirmEngagementMax);
+      break;
+  }
+
   if (v8::MicrotasksScope::IsRunningMicrotasks(scriptState->isolate())) {
     UseCounter::count(document(), UseCounter::During_Microtask_Confirm);
   }
@@ -805,6 +847,27 @@ String LocalDOMWindow::prompt(ScriptState* scriptState,
     return String();
   }
 
+  switch (document()->getEngagementLevel()) {
+    case mojom::blink::EngagementLevel::NONE:
+      UseCounter::count(document(), UseCounter::PromptEngagementNone);
+      break;
+    case mojom::blink::EngagementLevel::MINIMAL:
+      UseCounter::count(document(), UseCounter::PromptEngagementMinimal);
+      break;
+    case mojom::blink::EngagementLevel::LOW:
+      UseCounter::count(document(), UseCounter::PromptEngagementLow);
+      break;
+    case mojom::blink::EngagementLevel::MEDIUM:
+      UseCounter::count(document(), UseCounter::PromptEngagementMedium);
+      break;
+    case mojom::blink::EngagementLevel::HIGH:
+      UseCounter::count(document(), UseCounter::PromptEngagementHigh);
+      break;
+    case mojom::blink::EngagementLevel::MAX:
+      UseCounter::count(document(), UseCounter::PromptEngagementMax);
+      break;
+  }
+
   if (v8::MicrotasksScope::IsRunningMicrotasks(scriptState->isolate())) {
     UseCounter::count(document(), UseCounter::During_Microtask_Prompt);
   }