android: Fix crash in blink::LayoutText::localCaretRect()

third_party/WebKit/Source/core/layout/LayoutText.cpp

Index: third_party/WebKit/Source/core/layout/LayoutText.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutText.cpp b/third_party/WebKit/Source/core/layout/LayoutText.cpp
index 8920eabe57c990ce87f7fb7ec84b112a32f82385..5b8de4d5aca83c20aaefd844e32be4bea10545f3 100644
--- a/third_party/WebKit/Source/core/layout/LayoutText.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutText.cpp
@@ -755,6 +755,9 @@ LayoutRect LayoutText::localCaretRect(InlineBox* inlineBox,
   // Get caret height from a font of character.
   const ComputedStyle* styleToUse =
       caretBox->getLineLayoutItem().style(caretBox->isFirstLineStyle());
+  if (!styleToUse->font().primaryFont())
+    return LayoutRect();
+
   int height = styleToUse->font().primaryFont()->getFontMetrics().height();
   int top = caretBox->logicalTop().toInt();