Ensure clean layout before calling plainText() (flat tree version)

third_party/WebKit/Source/core/testing/Internals.cpp

Index: third_party/WebKit/Source/core/testing/Internals.cpp
diff --git a/third_party/WebKit/Source/core/testing/Internals.cpp b/third_party/WebKit/Source/core/testing/Internals.cpp
index 474763c1d0db5afb481283dd8391ed70c217415f..7513325166527e7e59d05b38238766a167bc8611 100644
--- a/third_party/WebKit/Source/core/testing/Internals.cpp
+++ b/third_party/WebKit/Source/core/testing/Internals.cpp
@@ -2476,9 +2476,12 @@ String Internals::selectedHTMLForClipboard()
 
 String Internals::selectedTextForClipboard()
 {
-    if (!frame())
+    if (!frame() || !frame()->document())
         return String();
 
+    // Clean layout is required for extracting plain text from selection.
+    frame()->document()->updateStyleAndLayoutIgnorePendingStylesheets();
+
     return frame()->selection().selectedTextForClipboard();
 }