Fix bug on Android causing composition underlines to appear in the wrong place

third_party/WebKit/Source/core/editing/InputMethodController.cpp

Index: third_party/WebKit/Source/core/editing/InputMethodController.cpp
diff --git a/third_party/WebKit/Source/core/editing/InputMethodController.cpp b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
index 7ea8eddf77aaa70f6038d00a88f883508d7364c3..f019fb6048f74f6eb27bade5f60e366f1e509cce 100644
--- a/third_party/WebKit/Source/core/editing/InputMethodController.cpp
+++ b/third_party/WebKit/Source/core/editing/InputMethodController.cpp
@@ -620,7 +620,10 @@ void InputMethodController::setComposition(
     return;
   }
 
-  addCompositionUnderlines(underlines, baseNode->parentNode(), baseOffset);
+  const PlainTextRange compositionPlainTextRange =
+      PlainTextRange::create(*baseNode->parentNode(), *m_compositionRange);
+  addCompositionUnderlines(underlines, baseNode->parentNode(),
+                           compositionPlainTextRange.start());
 }
 
 PlainTextRange InputMethodController::createSelectionRangeForSetComposition(