Add a method to retrieve the top synchronous suggestion.

chrome/browser/android/omnibox/autocomplete_controller_android.cc

Index: chrome/browser/android/omnibox/autocomplete_controller_android.cc
diff --git a/chrome/browser/android/omnibox/autocomplete_controller_android.cc b/chrome/browser/android/omnibox/autocomplete_controller_android.cc
index c976ebee25250f3c019b40939a17c2531c0f90c3..b1350b011f9d3ada269ff7c9a188269c4f3322f4 100644
--- a/chrome/browser/android/omnibox/autocomplete_controller_android.cc
+++ b/chrome/browser/android/omnibox/autocomplete_controller_android.cc
@@ -115,7 +115,7 @@ void ZeroSuggestPrefetcher::OnResultChanged(bool default_match_changed) {
 AutocompleteControllerAndroid::AutocompleteControllerAndroid(Profile* profile)
     : autocomplete_controller_(new AutocompleteController(
           profile, this, kAndroidAutocompleteProviders)),
-      inside_classify_(false),
+      inside_synchronous_start_(false),
       profile_(profile) {
 }
 
@@ -159,9 +159,9 @@ ScopedJavaLocalRef<jobject> AutocompleteControllerAndroid::Classify(
   if (!autocomplete_controller_)
     return ScopedJavaLocalRef<jobject>();
 
-  inside_classify_ = true;
+  inside_synchronous_start_ = true;
   Start(env, obj, j_text, NULL, NULL, true, false, false, false);
-  inside_classify_ = false;
+  inside_synchronous_start_ = false;
   DCHECK(autocomplete_controller_->done());
   const AutocompleteResult& result = autocomplete_controller_->result();
   if (result.empty())
@@ -274,6 +274,35 @@ AutocompleteControllerAndroid::UpdateMatchDestinationURL(
   return ConvertUTF8ToJavaString(env, match.destination_url.spec());
 }
 
+ScopedJavaLocalRef<jobject>
+AutocompleteControllerAndroid::GetTopSynchronousMatch(JNIEnv* env,

[Yusuf, 2014/06/05 21:56:06]

One question is the difference between this and classify. Can they share a bit
more code? It looks like there is one boolean flag that is different and one
just calls start with the initial input params and the other constructs the
input object and sends this to start.

Can we do most of this in a private shared method and pass one or two params to
control?

+                                                      jobject obj,
+                                                      jstring query) {
+  if (!autocomplete_controller_)
+    return ScopedJavaLocalRef<jobject>();
+
+  base::string16 text(ConvertJavaStringToUTF16(env, query));
+  // Request synchronous matches only.
+  AutocompleteInput input(text,
+                          base::string16::npos,
+                          base::string16(),
+                          GURL(),
+                          AutocompleteInput::INVALID_SPEC,
+                          false,
+                          false,
+                          false,
+                          false);
+  inside_synchronous_start_ = true;
+  autocomplete_controller_->Start(input);
+  inside_synchronous_start_ = false;
+  DCHECK(autocomplete_controller_->done());
+  const AutocompleteResult& result = autocomplete_controller_->result();
+  if (result.empty())
+    return ScopedJavaLocalRef<jobject>();
+
+  return BuildOmniboxSuggestion(env, *result.begin());
+}
+
 void AutocompleteControllerAndroid::Shutdown() {
   autocomplete_controller_.reset();
 
@@ -333,7 +362,7 @@ void AutocompleteControllerAndroid::InitJNI(JNIEnv* env, jobject obj) {
 
 void AutocompleteControllerAndroid::OnResultChanged(
     bool default_match_changed) {
-  if (autocomplete_controller_.get() != NULL && !inside_classify_)
+  if (autocomplete_controller_.get() != NULL && !inside_synchronous_start_)
     NotifySuggestionsReceived(autocomplete_controller_->result());
 }