Webkit setting for embedders that do not support fullscreen.

Source/web/WebSettingsImpl.h

Index: Source/web/WebSettingsImpl.h
diff --git a/Source/web/WebSettingsImpl.h b/Source/web/WebSettingsImpl.h
index 6838c9e1d866ebd72f3c0a72d51eeafee7e03726..d1da245b9fc9f4a5e7c1e5c4c8f716cc8ece279f 100644
--- a/Source/web/WebSettingsImpl.h
+++ b/Source/web/WebSettingsImpl.h
@@ -98,6 +98,7 @@ public:
     virtual void setExperimentalWebGLEnabled(bool) OVERRIDE;
     virtual void setFantasyFontFamily(const WebString&, UScriptCode = USCRIPT_COMMON) OVERRIDE;
     virtual void setFixedFontFamily(const WebString&, UScriptCode = USCRIPT_COMMON) OVERRIDE;
+    virtual void setFullscreenEnabled(bool) OVERRIDE;
     virtual void setHyperlinkAuditingEnabled(bool) OVERRIDE;
     virtual void setIgnoreMainFrameOverflowHiddenQuirk(bool) OVERRIDE;
     virtual void setImagesEnabled(bool) OVERRIDE;
@@ -176,6 +177,7 @@ public:
     bool renderVSyncNotificationEnabled() const { return m_renderVSyncNotificationEnabled; }
     bool autoZoomFocusedNodeToLegibleScale() const { return m_autoZoomFocusedNodeToLegibleScale; }
     bool doubleTapToZoomEnabled() const { return m_doubleTapToZoomEnabled; }
+    bool fullscreenEnabled() const { return m_fullscreenEnabled; }
     bool perTilePaintingEnabled() const { return m_perTilePaintingEnabled; }
     bool supportDeprecatedTargetDensityDPI() const { return m_supportDeprecatedTargetDensityDPI; }
     bool useExpandedHeuristicsForGpuRasterization() const { return m_useExpandedHeuristicsForGpuRasterization; }
@@ -192,6 +194,7 @@ private:
     bool m_autoZoomFocusedNodeToLegibleScale;
     bool m_deferredImageDecodingEnabled;
     bool m_doubleTapToZoomEnabled;
+    bool m_fullscreenEnabled;
     bool m_perTilePaintingEnabled;
     bool m_supportDeprecatedTargetDensityDPI;
     bool m_shrinksViewportContentToFit;