Mixed Content: Implement strict mode.

Source/core/loader/FrameLoader.cpp

Index: Source/core/loader/FrameLoader.cpp
diff --git a/Source/core/loader/FrameLoader.cpp b/Source/core/loader/FrameLoader.cpp
index d73762d3dbf03e4e6b14aa4a095aea1767ec6d14..6d13c340ae3efdb10973e49096e9b344f2676df9 100644
--- a/Source/core/loader/FrameLoader.cpp
+++ b/Source/core/loader/FrameLoader.cpp
@@ -1439,4 +1439,18 @@ SandboxFlags FrameLoader::effectiveSandboxFlags() const
     return flags;
 }
 
+bool FrameLoader::shouldEnforceStrictMixedContentChecking() const
+{
+    Frame* parentFrame = m_frame->tree().parent();
+    if (!parentFrame)
+        return false;
+
+    // FIXME: We need a way to propagate strict mixed content checking flags to
+    // out-of-process frames. For now, we'll always enforce.
+    if (!parentFrame->isLocalFrame())
+        return true;
+
+    return toLocalFrame(parentFrame)->document()->shouldEnforceStrictMixedContentChecking();
+}
+
 } // namespace blink