[Android WebView] Treat zero values in viewport arguments specially

Source/core/dom/ViewportArguments.cpp

Index: Source/core/dom/ViewportArguments.cpp
diff --git a/Source/core/dom/ViewportArguments.cpp b/Source/core/dom/ViewportArguments.cpp
index 0a2708dd1f07b1b02f760d61f5acb4d501683393..9228ffca680a997140e986c8ad730cc9713c566c 100644
--- a/Source/core/dom/ViewportArguments.cpp
+++ b/Source/core/dom/ViewportArguments.cpp
@@ -166,6 +166,20 @@ PageScaleConstraints ViewportArguments::resolve(const FloatSize& initialViewport
         return result;
     }
 
+    if (type == ViewportArguments::ViewportMetaLayoutSizeAndZeroValuesQuirk) {
+        if (!static_cast<int>(resultWidth)) {
+            resultWidth = ViewportArguments::ValueDeviceWidth;
+            if (!static_cast<int>(resultZoom))
+                resultZoom = 1.0;
+        }
+        if (!static_cast<int>(resultHeight))
+            resultHeight = ViewportArguments::ValueDeviceHeight;
+        if (!static_cast<int>(resultMinZoom))
+            resultMinZoom = ViewportArguments::ValueAuto;
+        if (!static_cast<int>(resultMaxZoom))
+            resultMaxZoom = ViewportArguments::ValueAuto;
+    }
+
     switch (static_cast<int>(resultWidth)) {
     case ViewportArguments::ValueDeviceWidth:
         resultWidth = initialViewportSize.width();