Add WebDocument::isMobileFriendly() to blink

third_party/WebKit/Source/web/WebDocument.cpp

Index: third_party/WebKit/Source/web/WebDocument.cpp
diff --git a/third_party/WebKit/Source/web/WebDocument.cpp b/third_party/WebKit/Source/web/WebDocument.cpp
index 8931b88119c87fcc0724bb90697e608ac04d596a..be3d67d2f0b322dc8240c937a18c5318883433e2 100644
--- a/third_party/WebKit/Source/web/WebDocument.cpp
+++ b/third_party/WebKit/Source/web/WebDocument.cpp
@@ -44,6 +44,7 @@
 #include "core/dom/Fullscreen.h"
 #include "core/dom/StyleEngine.h"
 #include "core/events/Event.h"
+#include "core/frame/FrameHost.h"
 #include "core/html/HTMLAllCollection.h"
 #include "core/html/HTMLBodyElement.h"
 #include "core/html/HTMLCollection.h"
@@ -329,6 +330,14 @@ WebDistillabilityFeatures WebDocument::distillabilityFeatures()
     return DocumentStatisticsCollector::collectStatistics(*unwrap<Document>());
 }
 
+bool WebDocument::isMobileFriendly()
+{
+    FrameHost* frameHost = unwrap<Document>()->frameHost();
+    if (!frameHost)
+        return false;
+    return frameHost->visualViewport().shouldDisableDesktopWorkarounds();
+}
+
 WebDocument::WebDocument(const PassRefPtrWillBeRawPtr<Document>& elem)
     : WebNode(elem)
 {