Experimental viewport meta tag support for desktop, Blink-side.

Source/core/page/Settings.h

Index: Source/core/page/Settings.h
diff --git a/Source/core/page/Settings.h b/Source/core/page/Settings.h
index 41f89e23f784d89be55ed04f1b272b3e101d9821..8efba5f26c7fe5786796474015a460e07c0f2ca3 100644
--- a/Source/core/page/Settings.h
+++ b/Source/core/page/Settings.h
@@ -148,6 +148,9 @@ public:
     void setViewportEnabled(bool);
     bool viewportEnabled() const { return m_viewportEnabled; }
 
+    void setViewportMetaEnabled(bool);
+    bool viewportMetaEnabled() const { return m_viewportMetaEnabled; }
+
     // FIXME: This is a temporary flag and should be removed once accelerated
     // overflow scroll is ready (crbug.com/254111).
     void setCompositorDrivenAcceleratedScrollingEnabled(bool enabled) { m_compositorDrivenAcceleratedScrollingEnabled = enabled; }
@@ -185,6 +188,7 @@ private:
     bool m_touchEventEmulationEnabled : 1;
     bool m_openGLMultisamplingEnabled : 1;
     bool m_viewportEnabled : 1;
+    bool m_viewportMetaEnabled : 1;
 
     // FIXME: This is a temporary flag and should be removed once accelerated
     // overflow scroll is ready (crbug.com/254111).