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 46b1370c1fb8f47cc5848930a7b22cf62f60314f..ee324e4e1e7a059ae292baee227e902ebe1e6d31 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(