Add "lax mixed content checking" runtime flag.

Source/core/testing/InternalSettings.cpp

Index: Source/core/testing/InternalSettings.cpp
diff --git a/Source/core/testing/InternalSettings.cpp b/Source/core/testing/InternalSettings.cpp
index 23532b7468c615cdbbfa3e432a5461f66b3850bb..fe2e6b2d066c78fd26e43758a892242f806c2901 100644
--- a/Source/core/testing/InternalSettings.cpp
+++ b/Source/core/testing/InternalSettings.cpp
@@ -60,6 +60,7 @@ InternalSettings::Backup::Backup(Settings* settings)
     : m_originalCSSExclusionsEnabled(RuntimeEnabledFeatures::cssExclusionsEnabled())
     , m_originalAuthorShadowDOMForAnyElementEnabled(RuntimeEnabledFeatures::authorShadowDOMForAnyElementEnabled())
     , m_originalCSP(RuntimeEnabledFeatures::experimentalContentSecurityPolicyFeaturesEnabled())
+    , m_originalLaxMixedContentCheckingEnabled(RuntimeEnabledFeatures::laxMixedContentCheckingEnabled())
     , m_originalOverlayScrollbarsEnabled(RuntimeEnabledFeatures::overlayScrollbarsEnabled())
     , m_originalEditingBehavior(settings->editingBehaviorType())
     , m_originalTextAutosizingEnabled(settings->textAutosizingEnabled())
@@ -80,6 +81,7 @@ void InternalSettings::Backup::restoreTo(Settings* settings)
     RuntimeEnabledFeatures::setCSSExclusionsEnabled(m_originalCSSExclusionsEnabled);
     RuntimeEnabledFeatures::setAuthorShadowDOMForAnyElementEnabled(m_originalAuthorShadowDOMForAnyElementEnabled);
     RuntimeEnabledFeatures::setExperimentalContentSecurityPolicyFeaturesEnabled(m_originalCSP);
+    RuntimeEnabledFeatures::setLaxMixedContentCheckingEnabled(m_originalLaxMixedContentCheckingEnabled);
     RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(m_originalOverlayScrollbarsEnabled);
     settings->setEditingBehaviorType(m_originalEditingBehavior);
     settings->setTextAutosizingEnabled(m_originalTextAutosizingEnabled);
@@ -178,6 +180,11 @@ void InternalSettings::setExperimentalContentSecurityPolicyFeaturesEnabled(bool
     RuntimeEnabledFeatures::setExperimentalContentSecurityPolicyFeaturesEnabled(enabled);
 }
 
+void InternalSettings::setLaxMixedContentCheckingEnabled(bool enabled)
+{
+    RuntimeEnabledFeatures::setLaxMixedContentCheckingEnabled(enabled);
+}
+
 void InternalSettings::setPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled(bool enabled)
 {
     RuntimeEnabledFeatures::setPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled(enabled);