Expand GPU rasterization trigger for Finch experiment

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 94ab8cc45b04f89c0276867bc1c142168416aa00..91cc70fbc292525e9d05b61743b1f00ee9d860e0 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -2883,13 +2883,19 @@ void WebViewImpl::updatePageDefinedViewportConstraints(const ViewportDescription
 
     Document* document = page()->mainFrame()->document();
 
-    m_matchesHeuristicsForGpuRasterization = description.maxWidth == Length(DeviceWidth)
-        && description.minZoom == 1.0
-        && description.minZoomIsExplicit
-        && description.zoom == 1.0
-        && description.zoomIsExplicit
-        && description.userZoom
-        && description.userZoomIsExplicit;
+    if (m_client && m_client->useExpandedHeuristicsForGpuRasterization()) {
+        m_matchesHeuristicsForGpuRasterization = description.maxWidth == Length(DeviceWidth)
+            && description.minZoom == 1.0
+            && description.minZoomIsExplicit;
+    } else {
+        m_matchesHeuristicsForGpuRasterization = description.maxWidth == Length(DeviceWidth)
+            && description.minZoom == 1.0
+            && description.minZoomIsExplicit
+            && description.zoom == 1.0
+            && description.zoomIsExplicit
+            && description.userZoom
+            && description.userZoomIsExplicit;
+    }
     if (m_layerTreeView)
         m_layerTreeView->heuristicsForGpuRasterizationUpdated(m_matchesHeuristicsForGpuRasterization);