Add search suggestions fetched from the server

Fix athena::AppListViewDelegate to show multiple results.
Use SearchSuggestionParser in UrlSearchProvider

BUG=399561

Review URL: https://codereview.chromium.org/438023002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287504 0039d316-1c4b-4281-b951-d872f2087c98

athena/home/app_list_view_delegate.cc

@@ -51,9 +51,12 @@ void AppListViewDelegate::SearchResultChanged() {
   app_list::SearchProvider* search_provider = search_providers_[0];
   std::vector<app_list::SearchResult*> results;
   search_provider->ReleaseResult(&results);
-  model_->results()->DeleteAll();
-  for (size_t i = 0; i < results.size(); ++i)
-    model_->results()->Add(results[i]);
+  if (results.empty()) {
+    model_->results()->DeleteAll();
+  } else {
+    for (size_t i = 0; i < results.size(); ++i)
+      model_->results()->Add(results[i]);
+  }
 }
 
 bool AppListViewDelegate::ForceNativeDesktop() const {

athena/main/url_search_provider.h

@@ -6,6 +6,8 @@
 #define ATHENA_MAIN_URL_SEARCH_PROVIDER_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "components/autocomplete/autocomplete_input.h"
+#include "net/url_request/url_fetcher_delegate.h"
 #include "ui/app_list/search_provider.h"
 
 class TemplateURLService;
@@ -17,7 +19,8 @@ class BrowserContext;
 namespace athena {
 
 // A sample search provider.
-class UrlSearchProvider : public app_list::SearchProvider {
+class UrlSearchProvider : public app_list::SearchProvider,
+                          public net::URLFetcherDelegate {
  public:
   UrlSearchProvider(content::BrowserContext* browser_context);
   virtual ~UrlSearchProvider();
@@ -26,12 +29,21 @@ class UrlSearchProvider : public app_list::SearchProvider {
   virtual void Start(const base::string16& query) OVERRIDE;
   virtual void Stop() OVERRIDE;
 
+  // Overridden from net::URLFetcherDelegate.
+  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
+
  private:
+  void StartFetchingSuggestions();
+
   content::BrowserContext* browser_context_;
 
   // TODO(mukai): This should be provided through BrowserContextKeyedService.
   scoped_ptr<TemplateURLService> template_url_service_;
 
+  AutocompleteInput input_;
+  scoped_ptr<net::URLFetcher> suggestion_fetcher_;
+  bool should_fetch_suggestions_again_;
+
   DISALLOW_COPY_AND_ASSIGN(UrlSearchProvider);
 };