Revert of Remove V8RecrusionScope, cleanup call sites.

third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h

+/*
+ * Copyright (C) 2012 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WebScopedMicrotaskSuppression_h
+#define WebScopedMicrotaskSuppression_h
+
+#include "../platform/WebPrivateOwnPtr.h"
+
+namespace blink {
+
+// This class wraps V8RecursionScope::BypassMicrotaskCheckpoint. Please
+// see V8RecursionScope.h for full usage. Short story: Embedder calls into
+// script contexts which also host page script must do one of two things:
+//
+//   1. If the call may cause any page/author script to run, it must be
+//      captured for pre/post work (e.g. inspector instrumentation/microtask
+//      delivery) and thus be invoked through WebFrame (e.g. executeScript*,
+//      callFunction*).
+//   2. If the call will not cause any page/author script to run, the call
+//      should be made directly via the v8 context, but the callsite must be
+//      accompanied by a stack allocated WebScopedMicrotaskSuppression, e.g.:
+//
+//        ...
+//        {
+//            blink::WebScopedMicrotaskSuppression suppression;
+//            func->Call(global, argv, args);
+//        }
+//        ...
+//
+class WebScopedMicrotaskSuppression {
+public:
+    WebScopedMicrotaskSuppression() { initialize(); }
+    ~WebScopedMicrotaskSuppression() { reset(); }
+
+private:
+    BLINK_EXPORT void initialize();
+    BLINK_EXPORT void reset();
+
+    // Always declare this data member. When assertions are on in
+    // Release builds of Blink, this header may be included from
+    // Chromium with different preprocessor options than used when
+    // building Blink itself.
+    class Impl;
+    WebPrivateOwnPtr<Impl> m_impl;
+};
+
+} // namespace blink
+
+#endif