Devtools: Add editable keyframes to the styles sidebar pane

third_party/WebKit/Source/core/css/StyleRuleKeyframe.cpp

Index: third_party/WebKit/Source/core/css/StyleRuleKeyframe.cpp
diff --git a/third_party/WebKit/Source/core/css/StyleRuleKeyframe.cpp b/third_party/WebKit/Source/core/css/StyleRuleKeyframe.cpp
index c49fdd6fca11d34cd65cb7d8ac1f8c0f81ec3b1f..146816d06bbb727db9254a32032e9d5ddd21f28b 100644
--- a/third_party/WebKit/Source/core/css/StyleRuleKeyframe.cpp
+++ b/third_party/WebKit/Source/core/css/StyleRuleKeyframe.cpp
@@ -24,7 +24,7 @@ String StyleRuleKeyframe::keyText() const
     StringBuilder keyText;
     for (unsigned i = 0; i < m_keys.size(); ++i) {
         if (i)
-            keyText.append(',');
+            keyText.appendLiteral(", ");
         keyText.appendNumber(m_keys.at(i) * 100);
         keyText.append('%');
     }