Implement IsSearchProviderInstalled and a test for it.

chrome/browser/renderer_host/render_view_host_delegate.h

Index: chrome/browser/renderer_host/render_view_host_delegate.h
diff --git a/chrome/browser/renderer_host/render_view_host_delegate.h b/chrome/browser/renderer_host/render_view_host_delegate.h
index eb2a5553695d9604969fbc2218ae6a935b4aad8d..836f45f7ec4ff4edbaa76f7d8572be8eba3b83db 100644
--- a/chrome/browser/renderer_host/render_view_host_delegate.h
+++ b/chrome/browser/renderer_host/render_view_host_delegate.h
@@ -41,6 +41,7 @@ class TabContents;
 struct ThumbnailScore;
 struct ViewHostMsg_DidPrintPage_Params;
 struct ViewHostMsg_FrameNavigate_Params;
+struct ViewHostMsg_GetSearchProviderInstallState_Params;
 struct ViewHostMsg_RunFileChooser_Params;
 struct WebDropData;
 class WebKeyboardEvent;
@@ -652,6 +653,11 @@ class RenderViewHostDelegate {
                            int32 page_id, const GURL& doc_url,
                            bool autodetected) {}
 
+  // Returns the install state of the search provider url (not installed,
+  // installed, default).
+  virtual ViewHostMsg_GetSearchProviderInstallState_Params
+      GetSearchProviderInstallState(const GURL& url);
+
   // |url| is assigned to a server that can provide alternate error pages.  If
   // the returned URL is empty, the default error page built into WebKit will
   // be used.