Revert of Remove WebSettings::setDisallowFullscreenForNonMediaElements(bool)...

Revert of Remove WebSettings::setDisallowFullscreenForNonMediaElements(bool) (https://codereview.chromium.org/416013002/)

Reason for revert:
We need this for the Android WebView

Original issue's description:
> Remove WebSettings::setDisallowFullscreenForNonMediaElements(bool)
> 
> It is never called from Chromium.
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=178831

TBR=jochen@chromium.org,qinmin@chromium.org,philipj@opera.com
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/422923002

git-svn-id: svn://svn.chromium.org/blink/trunk@179048 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/web/FullscreenController.cpp

@@ -155,6 +155,9 @@ void FullscreenController::didExitFullScreen()
 
 void FullscreenController::enterFullScreenForElement(blink::Element* element)
 {
+    if (m_webViewImpl->settingsImpl()->disallowFullscreenForNonMediaElements() && !isHTMLMediaElement(element))
+        return;
+
     // We are already transitioning to fullscreen for a different element.
     if (m_provisionalFullScreenElement) {
         m_provisionalFullScreenElement = element;

third_party/WebKit/Source/web/WebSettingsImpl.cpp

@@ -58,6 +58,7 @@ WebSettingsImpl::WebSettingsImpl(Settings* settings, InspectorController* inspec
     , m_viewportMetaNonUserScalableQuirk(false)
     , m_clobberUserAgentInitialScaleQuirk(false)
     , m_mainFrameResizesAreOrientationChanges(false)
+    , m_disallowFullscreenForNonMediaElements(false)
 {
     ASSERT(settings);
 }
@@ -695,4 +696,9 @@ void WebSettingsImpl::setMainFrameResizesAreOrientationChanges(bool enabled)
     m_mainFrameResizesAreOrientationChanges = enabled;
 }
 
+void WebSettingsImpl::setDisallowFullscreenForNonMediaElements(bool enabled)
+{
+    m_disallowFullscreenForNonMediaElements = enabled;
+}
+
 } // namespace blink

third_party/WebKit/Source/web/WebSettingsImpl.h

@@ -89,6 +89,7 @@ public:
     virtual void setDeviceScaleAdjustment(float) OVERRIDE;
     virtual void setDeviceSupportsMouse(bool) OVERRIDE;
     virtual void setDeviceSupportsTouch(bool) OVERRIDE;
+    virtual void setDisallowFullscreenForNonMediaElements(bool) OVERRIDE;
     virtual void setDoubleTapToZoomEnabled(bool) OVERRIDE;
     virtual void setDownloadableBinaryFontsEnabled(bool) OVERRIDE;
     virtual void setEditingBehavior(EditingBehavior) OVERRIDE;
@@ -175,6 +176,7 @@ public:
     bool showPaintRects() const { return m_showPaintRects; }
     bool renderVSyncNotificationEnabled() const { return m_renderVSyncNotificationEnabled; }
     bool autoZoomFocusedNodeToLegibleScale() const { return m_autoZoomFocusedNodeToLegibleScale; }
+    bool disallowFullscreenForNonMediaElements() const { return m_disallowFullscreenForNonMediaElements; }
     bool doubleTapToZoomEnabled() const { return m_doubleTapToZoomEnabled; }
     bool perTilePaintingEnabled() const { return m_perTilePaintingEnabled; }
     bool supportDeprecatedTargetDensityDPI() const { return m_supportDeprecatedTargetDensityDPI; }
@@ -209,6 +211,7 @@ private:
     // can be removed any time after 2015. See http://crbug.com/313754.
     bool m_clobberUserAgentInitialScaleQuirk;
     bool m_mainFrameResizesAreOrientationChanges;
+    bool m_disallowFullscreenForNonMediaElements;
 };
 
 } // namespace blink

third_party/WebKit/public/web/WebSettings.h

@@ -106,6 +106,7 @@ public:
     virtual void setDefaultFontSize(int) = 0;
     virtual void setDefaultTextEncodingName(const WebString&) = 0;
     virtual void setDefaultVideoPosterURL(const WebString&) = 0;
+    virtual void setDisallowFullscreenForNonMediaElements(bool) = 0;
     void setDeferred2dCanvasEnabled(bool) { } // temporary stub
     virtual void setDeferredFiltersEnabled(bool) = 0;
     virtual void setDeferredImageDecodingEnabled(bool) = 0;