Disallow certain blocking DOM calls during microtask execution.

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

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
index 8bb12b520ce7ecf05683b7470b138fe258ad0dea..be699b5cebddfde194306dee8d31ef5a38bc0c44 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -373,6 +373,21 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature)
     case UseCounter::V8KeyboardEvent_KeyIdentifier_AttributeGetter:
         return willBeRemoved("'KeyboardEvent.keyIdentifier'", 53, "5316065118650368");
 
+    case UseCounter::During_Microtask_Alert:
+        return willBeRemoved("Invoking 'alert()' during microtask execution", 53, "5647113010544640");
+
+    case UseCounter::During_Microtask_Confirm:
+        return willBeRemoved("Invoking 'confirm()' during microtask execution", 53, "5647113010544640");
+
+    case UseCounter::During_Microtask_Print:
+        return willBeRemoved("Invoking 'print()' during microtask execution", 53, "5647113010544640");
+
+    case UseCounter::During_Microtask_Prompt:
+        return willBeRemoved("Invoking 'prompt()' during microtask execution", 53, "5647113010544640");
+
+    case UseCounter::During_Microtask_SyncXHR:
+        return willBeRemoved("Invoking 'send()' on a sync XHR during microtask execution", 53, "5647113010544640");
+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();