[Android WebView] Add a quirk to clobber initial scale in certain cases

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 16706ac9b2da5cbaaa665b26de0d00df7f2d03ab..09ae305e3ac032e70c58adaef7a52f52c9378375 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -3005,6 +3005,14 @@ void WebViewImpl::updatePageDefinedViewportConstraints(const ViewportDescription
     }
     float oldInitialScale = m_pageScaleConstraintsSet.pageDefinedConstraints().initialScale;
     m_pageScaleConstraintsSet.updatePageDefinedConstraints(adjustedDescription, m_size);
+
+    if (settingsImpl()->clobberUserAgentInitialScaleQuirk()
+        && m_pageScaleConstraintsSet.userAgentConstraints().initialScale != -1
+        && m_pageScaleConstraintsSet.userAgentConstraints().initialScale * deviceScaleFactor() <= 1) {
+        if (!description.maxWidth.isFixed()
+            || (description.maxWidth == Length(100, ViewportPercentageWidth) && m_pageScaleConstraintsSet.pageDefinedConstraints().initialScale == 1.0f))
+            setInitialPageScaleOverride(-1);
+    }
     m_pageScaleConstraintsSet.adjustForAndroidWebViewQuirks(adjustedDescription, m_size, page()->settings().layoutFallbackWidth(), deviceScaleFactor(), settingsImpl()->supportDeprecatedTargetDensityDPI(), page()->settings().wideViewportQuirkEnabled(), page()->settings().useWideViewport(), page()->settings().loadWithOverviewMode());
     float newInitialScale = m_pageScaleConstraintsSet.pageDefinedConstraints().initialScale;
     if (oldInitialScale != newInitialScale && newInitialScale != -1) {