Extend WebSurroundingText to accept a WebRange.

Source/web/WebLocalFrameImpl.cpp

Index: Source/web/WebLocalFrameImpl.cpp
diff --git a/Source/web/WebLocalFrameImpl.cpp b/Source/web/WebLocalFrameImpl.cpp
index 0f7d09def92a947eb0c685d170f8c73e68a76815..f90b6c4a7fb96da3c289ddbba405f0da10f30c13 100644
--- a/Source/web/WebLocalFrameImpl.cpp
+++ b/Source/web/WebLocalFrameImpl.cpp
@@ -94,6 +94,7 @@
 #include "core/editing/InputMethodController.h"
 #include "core/editing/PlainTextRange.h"
 #include "core/editing/SpellChecker.h"
+#include "core/editing/SurroundingText.h"
 #include "core/editing/TextAffinity.h"
 #include "core/editing/TextIterator.h"
 #include "core/editing/htmlediting.h"
@@ -1300,6 +1301,16 @@ void WebLocalFrameImpl::setCaretVisible(bool visible)
     frame()->selection().setCaretVisible(visible);
 }
 
+WebString WebLocalFrameImpl::textSurroundingSelection(int maxLength, int* startOffset, int* endOffset) const
+{
+    ASSERT(maxLength > 0);
+
+    SurroundingText surroundingText(frame()->selection().start(), frame()->selection().end(), maxLength);
+    *startOffset = surroundingText.startOffsetInContent();
+    *endOffset = surroundingText.endOffsetInContent();
+    return surroundingText.content();
+}
+
 VisiblePosition WebLocalFrameImpl::visiblePositionForWindowPoint(const WebPoint& point)
 {
     FloatPoint unscaledPoint(point);