Update viewport trigger for GPU rasterization

Source/core/html/HTMLMetaElement.h

Index: Source/core/html/HTMLMetaElement.h
diff --git a/Source/core/html/HTMLMetaElement.h b/Source/core/html/HTMLMetaElement.h
index d7a143801ced3848454a1b9973c0898ceaf5ef06..11490c7a4366a64f072ea2aad700b53fa813fca8 100644
--- a/Source/core/html/HTMLMetaElement.h
+++ b/Source/core/html/HTMLMetaElement.h
@@ -57,8 +57,8 @@ private:
     float parsePositiveNumber(const String& key, const String& value, bool* ok = 0);
 
     Length parseViewportValueAsLength(const String& key, const String& value);
-    float parseViewportValueAsZoom(const String& key, const String& value);
-    bool parseViewportValueAsUserZoom(const String& key, const String& value);
+    float parseViewportValueAsZoom(const String& key, const String& value, bool& computedValueMatchesParsedValue);
+    bool parseViewportValueAsUserZoom(const String& key, const String& value, bool& computedValueMatchesParsedValue);
     float parseViewportValueAsDPI(const String& key, const String& value);
 
     void reportViewportWarning(ViewportErrorCode, const String& replacement1, const String& replacement2);