[Android WebView] Add a legacy quirk for 'user-scalable=no' case

Source/web/WebSettingsImpl.cpp

Index: Source/web/WebSettingsImpl.cpp
diff --git a/Source/web/WebSettingsImpl.cpp b/Source/web/WebSettingsImpl.cpp
index 0a9963d10bbf18d5c23708fb3fc068b122bd4ef7..0935804c9c414c3e837b73ee2e54b01c74ed3fac 100644
--- a/Source/web/WebSettingsImpl.cpp
+++ b/Source/web/WebSettingsImpl.cpp
@@ -57,6 +57,7 @@ WebSettingsImpl::WebSettingsImpl(Settings* settings)
     , m_doubleTapToZoomEnabled(false)
     , m_supportDeprecatedTargetDensityDPI(false)
     , m_viewportMetaLayoutSizeQuirk(false)
+    , m_viewportMetaNonUserScalableQuirk(false)
     , m_clobberUserAgentInitialScaleQuirk(false)
     , m_pinchOverlayScrollbarThickness(0)
     , m_mainFrameResizesAreOrientationChanges(false)
@@ -199,6 +200,11 @@ void WebSettingsImpl::setViewportMetaMergeContentQuirk(bool viewportMetaMergeCon
     m_settings->setViewportMetaMergeContentQuirk(viewportMetaMergeContentQuirk);
 }
 
+void WebSettingsImpl::setViewportMetaNonUserScalableQuirk(bool viewportMetaNonUserScalableQuirk)
+{
+    m_viewportMetaNonUserScalableQuirk = viewportMetaNonUserScalableQuirk;
+}
+
 void WebSettingsImpl::setViewportMetaZeroValuesQuirk(bool viewportMetaZeroValuesQuirk)
 {
     m_settings->setViewportMetaZeroValuesQuirk(viewportMetaZeroValuesQuirk);