Implement IsSearchProviderInstalled and a test for it.

chrome/browser/renderer_host/render_view_host.cc

Index: chrome/browser/renderer_host/render_view_host.cc
diff --git a/chrome/browser/renderer_host/render_view_host.cc b/chrome/browser/renderer_host/render_view_host.cc
index cf890e4590ce65775a4de6c6609a4a06f5c32def..3e834a3305f7e67de7ff57cfc066bad2e962fbd4 100644
--- a/chrome/browser/renderer_host/render_view_host.cc
+++ b/chrome/browser/renderer_host/render_view_host.cc
@@ -776,6 +776,8 @@ void RenderViewHost::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateDragCursor, OnUpdateDragCursor)
     IPC_MESSAGE_HANDLER(ViewHostMsg_TakeFocus, OnTakeFocus)
     IPC_MESSAGE_HANDLER(ViewHostMsg_PageHasOSDD, OnMsgPageHasOSDD)
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_GetSearchProviderInstallState,
+                                    OnMsgGetSearchProviderInstallState)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidGetPrintedPagesCount,
                         OnDidGetPrintedPagesCount)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidPrintPage, DidPrintPage)
@@ -1435,6 +1437,14 @@ void RenderViewHost::OnMsgPageHasOSDD(int32 page_id, const GURL& doc_url,
   delegate_->PageHasOSDD(this, page_id, doc_url, autodetected);
 }
 
+void RenderViewHost::OnMsgGetSearchProviderInstallState(
+    const GURL& url, IPC::Message* reply_msg) {
+  ViewHostMsg_GetSearchProviderInstallState::WriteReplyParams(
+      reply_msg,
+      delegate_->GetSearchProviderInstallState(url));
+  Send(reply_msg);
+}
+
 void RenderViewHost::OnDidGetPrintedPagesCount(int cookie, int number_pages) {
   RenderViewHostDelegate::Printing* printing_delegate =
       delegate_->GetPrintingDelegate();