Expose WebPageImportanceSignals to embedder

public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 32 matching lines @@
 
 namespace blink {
 
 class WebAXObject;
 class WebAutofillClient;
 class WebCompositedDisplayList;
 class WebCredentialManagerClient;
 class WebDragData;
 class WebFrame;
 class WebHitTestResult;
+class WebPageImportanceSignals;
 class WebPageOverlay;
 class WebPrerendererClient;
 class WebSettings;
 class WebSpellCheckClient;
 class WebString;
 class WebViewClient;
 struct WebActiveWheelFlingParameters;
 struct WebDeviceEmulationParams;
+struct WebFloatPoint;
 struct WebMediaPlayerAction;
 struct WebPluginAction;
 struct WebPoint;
-struct WebFloatPoint;
 struct WebWindowFeatures;
 
 class WebView : public WebWidget {
 public:
     BLINK_EXPORT static const double textSizeMultiplierRatio;
     BLINK_EXPORT static const double minTextSizeMultiplier;
     BLINK_EXPORT static const double maxTextSizeMultiplier;
 
     enum StyleInjectionTarget {
         InjectStyleInAllFrames,
@@ skipping 373 matching lines @@
 
     // Graphics -------------------------------------------------------------
 
     virtual WebCompositedDisplayList* compositedDisplayList() { return nullptr; }
 
     // PageOverlay ----------------------------------------------------------
 
     // Overlay this WebView with a solid color.
     virtual void setPageOverlayColor(WebColor) = 0;
 
+    // Page Importance Signals ----------------------------------------------
+
+    virtual WebPageImportanceSignals* pageImportanceSignals() { return nullptr; }
 
     // i18n -----------------------------------------------------------------
 
     // Inform the WebView that the accept languages have changed.
     // If the WebView wants to get the accept languages value, it will have
     // to call the WebViewClient::acceptLanguages().
     virtual void acceptLanguagesChanged() = 0;
 
     // Testing functionality for TestRunner ---------------------------------
 
     // Force the webgl context to fail so that webglcontextcreationerror
     // event gets generated/tested.
     virtual void forceNextWebGLContextCreationToFail() = 0;
 
     // Force the drawing buffer used by webgl contexts to fail so that the webgl
     // context's ability to deal with that failure gracefully can be tested.
     virtual void forceNextDrawingBufferCreationToFail() = 0;
 
 protected:
     ~WebView() {}
 };
 
 } // namespace blink
 
 #endif