Implement IsSearchProviderInstalled and a test for it.

chrome/renderer/render_view.cc

Index: chrome/renderer/render_view.cc
diff --git a/chrome/renderer/render_view.cc b/chrome/renderer/render_view.cc
index 1ef62454463f03bdb74755d0c30d7e4f3821ece6..e1dd0b00f61450036e39f79c21bcc7bc848322b5 100644
--- a/chrome/renderer/render_view.cc
+++ b/chrome/renderer/render_view.cc
@@ -1581,6 +1581,18 @@ void RenderView::AddSearchProvider(const std::string& url) {
                         false);  // not autodetected
 }
 
+ViewHostMsg_GetSearchProviderInstallState_Params
+RenderView::GetSearchProviderInstallState(const std::string& url) {
+  GURL inquiry_url = GURL(url);
+  if (inquiry_url.is_empty())
+    return ViewHostMsg_GetSearchProviderInstallState_Params::Denied();
+  ViewHostMsg_GetSearchProviderInstallState_Params install;
+  Send(new ViewHostMsg_GetSearchProviderInstallState(routing_id_,
+                                                     inquiry_url,
+                                                     &install));
+  return install;
+}
+
 void RenderView::OnMissingPluginStatus(
     WebPluginDelegateProxy* delegate,
     int status) {