Add feature use counting for window.external.AddSearchProvider (Blink side).

third_party/WebKit/public/web/WebLocalFrame.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebLocalFrame_h
 #define WebLocalFrame_h
 
 #include "WebFrame.h"
 #include "WebFrameLoadType.h"
 
@@ skipping 152 matching lines @@
     // Request to show an application install banner for the given |platforms|.
     // The implementation can request the embedder to cancel the call by setting
     // |cancel| to true.
     virtual void willShowInstallBannerPrompt(int requestId, const WebVector<WebString>& platforms, WebAppBannerPromptReply*) = 0;
 
     // Image reload -----------------------------------------------------------
 
     // If the provided node is an image, reload the image bypassing the cache.
     virtual void reloadImage(const WebNode&) = 0;
 
+    // Feature usage logging --------------------------------------------------
+
+    virtual void didCallAddSearchProvider() = 0;
+    virtual void didCallIsSearchProviderInstalled() = 0;
+
     // Testing ----------------------------------------------------------------
 
     // Registers a test interface factory. Takes ownership of the factory.
     virtual void registerTestInterface(const WebString& name, WebTestInterfaceFactory*) = 0;
 
     // Iframe sandbox ---------------------------------------------------------
 
     // Returns the effective sandbox flags which are inherited from their parent frame.
     virtual WebSandboxFlags effectiveSandboxFlags() const = 0;
 
 protected:
     explicit WebLocalFrame(WebTreeScopeType scope) : WebFrame(scope) { }
 };
 
 } // namespace blink
 
 #endif // WebLocalFrame_h